Atennis ball is dropped from 1.13 m above the
ground. it rebounds to a height of 0.876 m.
with what velocity does it hit the ground?
the acceleration of gravity is 9.8 m/s2. (let
down be negative.)
answer in units of m/s.

-4.71 m/s

Explanation:

Given:

y₀ = 1.13 m

y = 0 m

v₀ = 0 m/s

a = -9.8 m/s²

Find: v

v² = v₀² + 2a (y − y₀)

v² = (0 m/s)² + 2(-9.8 m/s²) (0 m − 1.13 m)

v = -4.71 m/s

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s