Question

A ball is thrown vertically with a velocity of 20 ms from the top of a building of height 25 m how high will the ball rise and how much time will it take to fall

Answer 1

Explanation:

PHYSICS

A ball is thrown vertically upwards with a velocity of 20ms

−1

from the top of a multi storey building.The height of the point where the ball is thrown 25 m from the ground.How long will it be before the ball hits the ground ? Take g=10ms

−2

.

December 20, 2019avatar

Lakshya Mathew

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ANSWER

Time to reach maximum height can be obtained from v=u+at

0=20+(−10)t

t=2s

s=ut+0.5at

2

=20(2)+0.5(−10)(2)

2

=20m

Thus, total distance for maximum height is 45 m

s=ut+0.5at

2

45=0+0.5(10)(t

′

)

2

t

′

=3s

Total time= 3+2= 5s

Answer 2

Please refer to the attachment for the solution...

Hope you get that right...