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)

Question

V=V_0+a(delta)t
(delta)x=(v+v_0/2)(delta)t
(delta)x=v_0(delta)t+1/2 a((delta)t)^2
v^2=v_0^2+2a(delta)x
(delta)x=v(delta)t01/2a((delta)t)^2

Answer 1

The kinematic equation that would be most useful for finding the ball's initial velocity is:

(delta)x = v₀(delta)t + 1/2a((delta)t)^2