Q

# Please help! A weight lifter lifts 300 kg from the ground to a height of 4m in 3 seconds. The average power generated by him is

A weight lifter lifts 300 kg from the ground to a height of 4m in 3 seconds. The average power generated by him is

• Option 1)

5880 W

• Option 2)

3920 W

• Option 3)

1960 W

• Option 4)

4410 W

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As we learnt in

Work done by time dependent force -

$W= \int \vec{F}\cdot \vec{v}\: dt$

- wherein

Where $\vec{F}$ and $\vec{v}$ are force and velocity vector at any instant

$Average\: power =\frac{total\: energy\: consumed}{total\:time\:taken}$

$=\frac{mgh}{3s}=\frac{5880}{3}=1960w$

Option 1)

5880 W

Option is incorrect

Option 2)

3920 W

Option is incorrect

Option 3)

1960 W

Option is correct

Option 4)

4410 W

Option is incorrect

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