A child is pulling two red wagons, with the second one tied to the first by a (non-stretching) rope. Each wagon has a mass of 14 kg. If the child exerts a force of 32 N for 6.0 m, how much has the kinetic energy of the two-wagon system changed?

Explanation:

work done by the child = force x displacement

= 32 x 6 = 192 J

This energy would have been added to the two body system ( two wagons ) in the form of kinetic energy . Initially the kinetic energy of the system was zero . The final kinetic energy of the system

= 0 + 192 J = 192 J

So change in the kinetic energy of the system

= 192 - 0 = 192 J .

c

explanation:

v=ir = 3x15 =45 v