maths

An aircraft dropped a box of emergency supplies to a group of trampers. The height of the box above the ground, h, at time, t is given by the formula; h = 520 - 5t^2, where h is in metres and t is in seconds.
Find how long it takes for the box to fall to the ground.

  1. 👍 0
  2. 👎 0
  3. 👁 61
asked by Shane
  1. 520 - 5 t ^ 2 = 0

    520 = 5 t ^ 2 Divide both sides by 5

    104 = t ^ 2

    t = sqrt ( 104 ) = 10. 198 sec

    1. 👍 0
    2. 👎 0
    posted by Bosnian

Respond to this Question

First Name

Your Response

Similar Questions

  1. maths

    An aircraft dropped a box of emergency supplies to a group of trampers. The height of the box above the ground, h, at time, t, is given by the formula: h = 520 - 5t^2 , where h is in metres and t is in seconds. Find how long it

    asked by Shane on May 19, 2014
  2. Maths/ Calc

    Supplies are dropped from a stationary (not moving up or down) helicopter and, after some amount of time, land on the ground with a velocity of -160 feet per second. Assumptions: Start time at t = 0 and ignore air resistance.

    asked by Eliz on April 18, 2013
  3. Math/ Calculus Help1

    Supplies are dropped from a stationary (not moving up or down) helicopter and, after some amount of time, land on the ground with a velocity of -160 feet per second. Assumptions: Start time at t = 0 and ignore air resistance.

    asked by Martin on April 16, 2013
  4. Math

    A helicopter drops a box of supplies after a disaster. The function represents the height y (in feet) of the box t seconds after it is dropped. After how many seconds does the box hit the ground? y=100-16t^2

    asked by Robert on April 30, 2018
  5. MATH VECTOR

    Nancy is a pilot in Canada¡¯s North. She needs to deliver emergency supplies to a location that is 500 km away. Nancy has set the aircraft¡¯s velocity to 270 km/h on a northbound heading. The wind velocity is 45 km/h from the

    asked by WON on September 23, 2016
  6. physics

    A airplane traveling 1019 m above the ocean at 135 km/h is to drop a box of supplies to shipwrecked victims below. (a) How many seconds before being exactly overhead should the box be dropped? ______ s (b) What is the horizontal

    asked by Eddie E. on October 12, 2011
  7. physics

    projectile motion question need help working through it an airplane travelling 1001meters above the ocean at 125km/h is going to drop a box of supplies to shipwrecked victims below. a) How many seconds before the plane is directly

    asked by jake on March 14, 2010
  8. physics

    An airplane traveling 1015 m above the ocean at 115 km/h is going to drop a box of supplies to shipwrecked victims below. (a) How many seconds before the plane is directly overhead should the box be dropped? (b) What is the

    asked by javane on November 26, 2010
  9. Physics

    An airplane traveling 1004 m above the ocean at 130 km/h is going to drop a box of supplies to shipwrecked victims below. (a) How many seconds before the plane is directly overhead should the box be dropped? (b) What is the

    asked by Brendan on October 4, 2016
  10. physics

    An airplane traveling 1007 m above the ocean at 150 km/h is going to drop a box of supplies to shipwrecked victims below. (a) How many seconds before the plane is directly overhead should the box be dropped?(b) What is the

    asked by denise on October 27, 2012

More Similar Questions