Preston pushes a wheelbarrow weighing 500 n to the top of a 50.0-m ramp, inclined at 20.0° with the horizontal, and leaves it. tamara accidentally bumps the wheelbarrow. it slides back down the ramp, during which an 80.0-n frictional force acts on it over the 50.0 m. what is the wheelbarrow's kinetic energy at the bottom at of the ramp

Explanation:

The principe of work and energy is applied:

The Work is negative because the Friction Force has a opposite direction as the displacement vector

The height is:

We replace this value in the Energy equation (mg=500N):

the second one and the forth one are in the purple because they are opinions and the rest are in the yellow

explanation:

the answer is 3.1 his answer is wrong mines is right