A rubber ball is dropped from a height of 1.5 m
(a) How long does it take to hit the ground?

t =0.6

Explanation:

So this is just a basic kinematics where the only force acting on the ball is gravity (9.8 m/s2 [down] and air resistance is negligible.

∆d=vi∆t+1/2at2

Because you're dropping the ball, initial velocity is 0

1.5= 0*(∆t) + 1/2a*t2

After some rearranging, t= root ((2*∆d)/a) Therefore t= 0.5532833352 or root(15)/7 t=0.6s

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