Question

Please solve this question.​

Answer 1

Explanation:

v=0, H =20m,g=10

I) v^2= u^2-2gh

0=u^2-2*10*20

u^2=400

u=20m/s

ii) u=0

v^2 =u^2+2gh

=0+2*10*20=400

v=20m/s

iii) v=u+gt

20=0+10*t

10*t=20

t=2 sec

total time taken by the ball =2*2=4s

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