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10-10-2019
Physics

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If a ball rolls off a 4m high table at 7m/s, how long will it take until it hits the floor

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10-10-2019

Answer:

0.9 s

Explanation:

Given (vertical direction):

y₀ = 4 m

y = 0 m

v₀ = 0 m/s

a = -9.8 m/s²

Find: t

y = y₀ + v₀ t + ½ at²

(0 m) = (4 m) + (0 m/s) t + ½ (-9.8 m/s²) t²

t ≈ 0.9 s

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