Question

1. A ball is thrown vertically upwards from ground with such a speed so that it just reaches the top of a building and then falls back. If it takes 7 s for the ball to return to the hands of thrower, calculate the height of the
building, approximately:​

Answer 1

Answer:

61.25 m

Explanation:

v=0

t=3.5 s

g= -10 ms^-2

by using v=u + gt

we got

u= 35 ms^-1

then,

by using v^2 - u^2=2gh

we got

h= 61.25 m

so, that is the height of building

Answer 2

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