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If a ball is dropped from a balloon that is 640 feet above the ground and rising at a rate of 48 feet per second find the time the ball is in the air and the speed of the ball when it hits the ground?
Wiki User
∙ 16y ago
Let v be the velocity when the ball is at 640 feets going downwards
v = 48 feet /sec
let the velocity with which it reaches the ground be u
then,
u2=v2+2gh
g = acc due t ogravity in feet/sq.sec
h = 640 feet
the time taken to reach the ground
= time to return to 640ft + the time to fall from there Time taken to get to the ground is 8 seconds. Final velocity is 208 feet per second downwards
Wiki User
∙ 16y ago
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