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/s2)

Answer :

Initial velocity, u =?

Final velocity, v = 0


Acceleration due to gravity, g = - 10m/s2


Height, h=5 m


(a) For a freely falling body:


v2 = u2 + 2gh


(0)2 = u2+ 2 x (-10) x 5


0= u2 – 100


u2 = 100


So, u = 10m/s


(b) Using relation, v=u + gt


0 = 10 + (-10) t


-10 = -10 t


t = 1sec


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