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In a shotput event an athlete throws the...

In a shotput event an athlete throws the shotput of mass 20 kg with an initial speed of `2 m s^(-1)` at `45^@` from height 3 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be `10 m s^(-2)`, the kinetic energy of the shotput when it just reaches the ground will be

A

2.5J

B

5J

C

525J

D

640 J

Text Solution

Verified by Experts

The correct Answer is:
D
Using law of energy conservation,
`(TME)_(i) = (TME)_(f)implies U_i+ K_i = U_f + K_f`
`implies 20 xx 10 xx 3 + 1/2 xx 20 xx 2^(2)= 0+ K_fimplies K_f= 640 J`
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