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Question

A ball is dropped from the top of a building. The ball takes 0.5s to fall past the window of 3m in length at certain distance from the top of the building. (g=10m/s2) How fast was the ball going as it passed the bottom of the window?

A
3.5 ms1
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B
8.5 ms1
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C
5 ms1
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D
12 ms1
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Solution

The correct option is A 8.5 ms1

s=ut+12gt2

3=u(0.5)+12×10(0.5)2

3=(0.5)u+5(0.25)

1.750.5=u

u=3.5 m/s
v=u+gt
v=(3.5)+10(0.5)=8.5 m/s


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