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In a shotput event, an athlete throws th...

In a shotput event, an athlete throws the shotput of mass `10kg` with an initial speed of `1ms^(-1)` at `45^(@)` from a heigth `1.5m` above ground. Assuming air resistance to be negligible and acceleration due to gravity to be `10ms^(-2)`, the kinetic energy of the shotput when it just reaches the ground will be

A

`2.5J`

B

`5.0J`

C

`52.5 J`

D

`155.0 J`

Text Solution

Verified by Experts

The correct Answer is:
D
As the shotput reaches the ground, its `K.E.=P.E.` of shotput when it is thrown `+K.E.`given
`=mgh+(1)/(2)m upsilon^(2)=10xx10xx1.5+(1)/(2)xx10(1)^(2)=150+5=155J`
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