A person on a bridge 25m above the water throws a rock straight downwards at 20m/s. a. How long does it take to hit the water?
B how fast is it going when it hits?

a) Δd=v₂Δt+aΔt²

v₂=0 (hits ground)

Δd=aΔt²

Δt²=Δd÷a

t=√25÷(9.8)  9.8m/s²=gravity

t=5÷4.8

t=1.04s

b) a=

a×t=v₂-v₁

v₂=(a×t)+v₁

v₂=(9.8×1.04)+20

v₂=10.192 + 20

v₂=30.192

v₂=30.2m/s rounded

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