First slide

Mechanical energy conservation

Question

A body of mass 5 Kg is raised vertically to a height of 10m by a force 170N. The velocity of the body at this height will be

Moderate

A

9.8 m/s
B

15 m/s
C

22 m/s
D

37 m/s

Solution

$\frac{1}{2} {mv}^{2} = (F - mg) \times h \Rightarrow \frac{1}{2} \times 5 \times v^{2} = (170 - 50) \times 10 \Rightarrow v = 22 m / s$

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