Physics: urgent help needed
posted by deepti .
i have a test on monday
1 A beach ball is thrown straight up with a speed of 10m/s from a point 2 m above the ground
a) Assuming no air reistance, calculate how far up the ball will go
b)At what speed will the ball eventually hit the ground?
c) If the air resistance exerts a constant force fo 10N during the journey, calculate the new maximum height and maximum speed of the ball.
2. A pitcher throws a fastball, off target, at a speed of 90 km/h and hits home plate. The ball of mass 0.14 kg is 2.2 m above the ground when it leaves the pither's hand
a)What is the total gravitational and kinetic energy of the ball at the time of release?
b) What is the ball's kinetic energy when it reaches home plate?
c) How fast is the ball moving when it collides with the home plate?


We will be happy to critique your thinking or work.
Respond to this Question
Similar Questions

Physics
A ball is thrown straight up from the ground with speed . At the same instant, a second ball is dropped from rest from a height , directly above the point where the first ball was thrown upward. There is no air resistance. Question … 
Physics
A ball is thrown straight up from the ground with speed v_0. At the same instant, a second ball is dropped from rest from a height H, directly above the point where the first ball was thrown upward. There is no air resistance. Find … 
Physics
Kevin stands at the edge of a cliff, holding one ball in each hand. He throws one of the balls straight up with speed v, and at the same time he throws the other ball straight down, also with speed v. Ignoring air resistance, which … 
Physics
A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 21.0 m/s? 
PHYSICS
A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 21.0 m/s vertical m from ground? 
PHYSICS
A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 21.0 m/s vertical m from ground? 
Physics
A ball is thrown from a point 1.0 m above the ground. The initial velocity is 19.6 m/s at an angle of 30 degrees above the horizontal. Find the maximum height of the ball above the ground. Calculate the speed of the ball at the highest … 
physics
a ball is thrown straight up with a speed of 8.0 m/s from a thirdfloor window located 13.0 m above ground. Calculate the maximum height, measured from the ground, of the ball; calculate the ball's velocity when it reaches the ground, … 
physics
A ball is thrown straight up from the ground at 10m/s, and simultaneously a ball is thrown straight down a 10mhigh ledge at 10m/s. At what height do the two balls pass? 
Urgent help! Physics
A ball is kicked into the air with a speed of 10m per second at angle of 60 degrees to the horizontal (take g=10). a) Calculate the horizontal and vertical speed of the ball b) Calculate the ball's time of flight c) Calculate the distance …