Question

A tennis ball is thrown from ground level with velocity v0 directed 30 degrees above the horizontal. If it takes the ball 1.0s to reach the top of its trajectory, what is the magnitude of the initial velocity?

Answer 1

Answer:

vi = 19.6 m/s

Explanation:

Given:

final velocity vf = 0

gravity a = -9.8

time t = 1

Initial velocity vi = vf - at

vi = 0 + 9.8 (1.0)

vi = 9.8 m/s

the y component of velocity is the initial velocity.

therefore v sin 30 = 9.8

vi/2 = 9.8

vi = 19.6 m/s