Question

a stone is thrown vertically upwards with a speed of 20m/s from the top of the building.the height of the building is 25 m from the ground

how will the ball rise?
how long will it take to reach the ground​

Answer 1

Answer:

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Answer 2

: 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