Hello, how to do qn 5?:)l

A

Explanation:

Please see the attached picture for the full solution.

Since we are only concerned about the decrease in gravitational potential energy of the car, we look at the decrease in height of the car as it moves from point X to point Y, instead of the distance travelled by the car.

50 inches should be the resultant vector

c) up is the direction the magnetic force is acting on the charge.