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A boy weighing 50 kg finished long jump ...

A boy weighing `50 kg` finished long jump at a distance of `8 m`. Considering that he moved along a parabolic path and his angle of jumps was `45^(@)`, his initial `KE` will be `g = 9.8 m//s^(2)`

A

`960 J`

B

`1560 J`

C

`2460 J`

D

`1960 J`

Text Solution

Verified by Experts

The correct Answer is:
B
Maximum range`= (u^(2))/(g) = R or u^(2) = Rg`
`KE = (1)/(2) m u^(2)= (1)/(2) mRg = (1)/(2) xx 50 xx8 xx 9.8 = 1960 J`
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Knowledge Check

  • A grasshopper finds that he can jump a maximum horizontal distance of 0.8m. With what speed can be travel along the road if he spends a negligible time on the ground?

    A
    2m/s
    B
    2.8m/s
    C
    104m/s
    D
    1m/s

  • A block of mass 50 kg slides over a horizontal distance of 1m. If the coefficient of friction between their surface is 0.2, then work done against friction is (take g = 9.8 m//s^(2) ) :

    A
    98 J
    B
    72 J
    C
    56 J
    D
    34 J
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