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Papessa [141]
3 years ago
10

A hoodlum throws a stone vertically downward with an initial speed of 12.0 m/s from the roof of a building,30.0 m above the grou

nd. (a) how long does it take the stone to reach the ground
Physics
1 answer:
bogdanovich [222]3 years ago
8 0
S=ut +1/2at2
30=12t+1/2*10*t2
5t2+12t-30=0
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A 40-kg rock is dropped from an elevation of 10 m. What is the velocity of the rock when it is 5-m from the ground?
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Answer:

Explanation:

Given

mass of rock m=40\ kg

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h=ut+\frac{1}{2}at^2

where, u=initial velocity

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here initial velocity is zero

when rock is 5 m from ground then it has traveled a distance of 5 m from top because total height is 10 m

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t^2=\frac{10}{9.8}

t=1.004\approx 1\ s

velocity at this time

v=u+at

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