When a cricket ball is thrown vertically upwards, it reaches a maximum height of 5 metres.
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 ms2 )
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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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