3) A dock worker pushes a 72 kg crate up a 2.0 m high,

7.0 m long ramp. Ignoring friction, how much work is

done on the crate?

Work done on the crate is 1411.2 J

Explanation:

Work done is defined as the product of force and the distance moved by the object. The unit of work done is in joules and denoted by the symbol J.

Work done = F * d

where F represents the force and d represents the distance moved by the object.

mass = 72 kg, distance moved by the object is given by 2.0 m

Force F = mass * gravity = 72 * 9.8

= 705.6 N = 706 N.

Work done = 706 * 2.0 = 1412 J.