) A ball is rolled horizontally off the top of a table. After 3 seconds the ball lands on the ground with a final velocity of −3.5 m/s. Which kinematic equation would be most useful for finding the ball’s initial velocity? (Assume a= −9.8 m/s2)

Answer 1

The most useful kinematic equation for finding the ball's initial velocity in this scenario would be:

v = u + at

where:
v = final velocity of the ball (−3.5 m/s)
u = initial velocity of the ball (what we're trying to find)
a = acceleration (-9.8 m/s^2, due to gravity)
t = time taken (3 seconds)