A block is moved from rest through a distance

Asked by admin @ 20/08/2021 in Physics viewed by 301 People

A block is moved from rest through a distance of 4m along a straight line path. the mass of the block is 5kg and the force acting on it is 20N. if kinetic energy acquired by the block be 40J. at what angle to the path the force is acting.

A) 30° B) 60°C) 45°D) none

Answered by admin @ 20/08/2021

FS Cosθ = K.E
Cosθ = K.E / (F S)
Cosθ = 40 / (20 × 4)
Cosθ = 1 / 2
Cosθ = Cos60
θ = 60°

(B) is the correct option

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