Question

A spring is streched 40mm by a force of 15N,what is the work done by the force

Answer 1

Answer:

Work done by the force = 0.3 J

Explanation:

elongation x = 40 mm = 0.04 m = 4 x 10⁻² m

Force F = 15 N

Spring force F =  k x

spring constant k = F/x  

work done by the force = 1/2 kx²

                                        = 1/2 F x

                                        = 1/2 x 15 x 4 x 10⁻²

                                        = 30 x 10⁻² J

                                        = 0.3 J