Question

A 100 g Plastic block moving at 4 m/s, what is the kinetic energy?

Answer 1

The total kinetic energy possessed by the block goes into the potential energy of the spring and the work done against friction.

Let x be the compression of the spring.

Thus

2

1

mv

2

=f

r

x+

2

1

kx

2

⟹5000x

2

+15x−16=0

⟹x=0.055m=5.5cm