Question

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

(a) 37m/s

(b) 22m/s

(c) 15m/s

(d) 9.8m/s

I had been asked this question in exam.

My question comes from Moment of Inertia topic in section System of Particles and Rotational Motion of Engineering Physics I

Answer 1

The correct answer is (b) 22m/s

The explanation: W = Gain in potential energy+Gain in kinetic energy

Fh = mgh + 1/2 mv^2

170×10=5×10×10+1/2×5×v^2

v = √480 = 22m/s.