physics

A ball is thrown vertically upward with a velocity of 100m/s.It will reach the ground after hw many sec?

  1. 👍 0
  2. 👎 0
  3. 👁 138
  1. The total time in the air is twice the time it takes for the ball to decelerate to 0 m/s (at the mazximum height). That time equals 2Vo/g, where Vo is the initial velocity.

    That would be 20.4 seconds.

    The maximum height reached would be 1020 m. A human cannot throw a ball that fast. The question is unrealisttic. Aerodynamic resistance would be appreciable.

    100 m/s is 328 miles/hour, nearly half the speed of sound.

    1. 👍 0
    2. 👎 0
  2. Take the values....V=om/s..U=100m/s...a=g=-10m/s(since it is against the gravity)..t=?....Using 1st kinematic equation i.e. V=U+at...putting all the values....0=100+(-10)t... -100=-10t....t=-100/-10..t=+10 sec.....since total time equals time taken going up nad going down...therefore t=10+10.....t=20sec.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math-

    A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2 a.) at what time will the ball strike the ground b.) for

    asked by danielle on March 25, 2012
  2. Algebra

    THe function h(t)=-16t^2+v0t+h0 describes the height in feet above the ground h(t) of an object thrown vertically from a height of h0 feet, with an initial velocity of v0 feet per second, if there is no air friction and t is the

    asked by Joe on April 19, 2010
  3. pre-calc

    Physics: a ball is thrown vertically upward with an initial velocity of 80 feet per second. the distance (in feet) of the ball from the ground after t seconds if s=80t-16tt^2 a) draw the illustration b) for what time interval is

    asked by steph on November 10, 2011
  4. Calculus

    If a ball is thrown vertically upward from the roof of 32 foot building with a velocity of 112 ft/sec, its height after t seconds is s(t)=32+112t–16t2 . What is the maximum height the ball reaches?What is the velocity of the

    asked by Jery on April 20, 2010
  1. Calculus 1

    A ball is thrown vertically upward from ground level with initial velocity of 96 feet per second. Assume the acceleration of the ball is a(t) = -32 ft^2 per second. (Neglect air Resistance.) (a) How long will it take the ball to

    asked by Bobby on December 3, 2018
  2. Quadratic equations

    A ball is thrown vertically upwards From the top of a building of height 29.4 m and with an initial velocity 24.5 m/sec. If the height H of the ball from the ground level is given by H = 29.4 + 24.5t - 4.9t², then find the time

    asked by Anonymous on July 16, 2017
  3. Physics

    A tennis ball is thrown vertically upward with an initial velocity of +8.0 m/s. a. what will the ball's speed be when it returns to its starting point? b. how long will the ball take to reach its starting point?

    asked by Eli on September 24, 2008
  4. calculus

    If a ball is thrown vertically upward from the roof of 64 foot building with a velocity of 64 ft/sec, its height after t seconds is s(t)=64+64t–16t2 . What is the maximum height the ball reaches? What is the velocity of the ball

    asked by michael on October 16, 2009
  1. calculus

    If a ball is thrown vertically upward with a velocity of 160 ft/s, then its height after t seconds is s = 160t - 16t^2 What is the velocity of the ball when it is 96 ft above the ground on its way up?

    asked by fred on November 14, 2008
  2. math

    A ball is thrown vertically upward from the ground with an initial velocity of 110ft/sec. Use h=−16t2+v0t+h0 I have no idea what i am doing

    asked by amber on March 24, 2019
  3. physics

    Two students are on a balcony 18.3 m above the street. One student throws a ball (ball 1) vertically downward at 12.2 m/s; at the same instant, the other student throws a ball (ball 2) vertically upward at the same speed. The

    asked by B on August 29, 2011
  4. math

    A person standing on the roof of a building throws a ball directly upward. The ball misses the rooftop on its way down and eventually strikes the ground. The function s(t) = −16t2 + 64t + 80 describes the ball’s height above

    asked by faith on December 15, 2011

You can view more similar questions or ask a new question.