Answer to Question #348189 in Physics for Mphundu

Question #348189

A girl throws a ball vertically upward at 10m/s from a roof of a building 20m high.


(a) How long will it take the ball to reach the ground?


(b) What will it's velocity be just before it strikes the ground?

1
Expert's answer
2022-06-06T08:53:49-0400
y=y0+v0tgt2/2y=y_0+v_0t-gt^2/2

y=20+10t4.9t2y=20+10t-4.9t^2

(a) at the ground y=0y=0

20+10t4.9t2=020+10t-4.9t^2=0

t=3.3st=3.3\:\rm s

(b)

v=v02+2gh=102+29.820=22m/sv=\sqrt{v_0^2+2gh}=\sqrt{10^2+2*9.8*20}=22\:\rm m/s


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Comments

Mphundu
06.06.22, 18:31

Thanks a lot

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