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Q.

A ball of mass 200 g is thrown upwards with an initial velocity of 30 m s-1. What is the kinetic energy at the highest point of its path?


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a

0

b

1

c

4

d

5 

answer is A.

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Detailed Solution

A ball of mass 200 g is thrown upwards with an initial velocity of 30 m s-1. The kinetic energy at the highest point of its path is 0.
Given data in the problem,
Initial velocity , u=30 m s-1
mass, m=200 g
=>m=0.2 kg.
So, when the ball is thrown upwards, it's kinetic energy starts converting into potential energy and when it reaches its maximum height the kinetic energy will be zero. So, the kinetic energy is zero.
 
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