Q. 424.8( 12 Votes )

# When a cricket ball is thrown vertically upwards, it reaches a maximum height of 5 metres.

(a) What was the initial speed of the ball?

(b) How much time is taken by the ball to reach the highest point? (g = 10 m/s^{2})

Answer :

Initial velocity, u =?

Final velocity, v = 0

Acceleration due to gravity, g = - 10m/s^{2}

Height, h=5 m

(a) For a freely falling body:

v^{2} = u^{2} + 2gh

(0)2 = u^{2}+ 2 x (-10) x 5

0= u^{2} – 100

u^{2} = 100

So, u = 10m/s

(b) Using relation, v=u + gt

0 = 10 + (-10) t

-10 = -10 t

t = 1sec

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