Question

A tennis ball is launched straight up from a height of 4 feet with an initial velocity of 64 feet per second. Use the

equation h(t) = -16ť² + vot+h, to determine when the tennis ball will be 52 feet in the air. Select all that apply.
01 second
2 seconds
3 seconds
5 seconds
6 seconds

Answer 1

When the ball hits the ground,

h=0

vt�16t^2=0

64t-16t^2=0..

t(64-16t)=0

t=0 (reject, not reasonable)

or

64-16t=0

16t=64

t=64/16=4

How long will it take for the ball to hit the ground? 4 seconds