when a cricket ball is thrown vertically upwards ,it reaches a maximum height of 5m.a)what was the initial speed of the ball.b)how much time is taken by the ball to reach the highest point.
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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
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
Answered by
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a)10 m/s (taking g=10m/s2)
b)1s
b)1s
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