Question

a ball is thrown straight upwards into the air within initial velocity of 20 metre per second how long will it take to the ball to reach at a height of 15 m how fast will lead them be going take jiske to 10 metre per second square​

Answer 1

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

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