Final answer:
The work done by the normal force is 980 Joules.
Step-by-step explanation:
The work done by the normal force can be determined by multiplying the force exerted by the normal force with the distance traveled. In this case, the force exerted by the normal force is equal to the weight of the cart, which is mg, where m is the mass of the cart (50 kg) and g is the acceleration due to gravity (9.8 m/s^2).
So, the work done by the normal force is:
Work = Force * Distance
Work = mg * Distance
Plugging in the values, we get:
Work = (50 kg * 9.8 m/s^2) * 20 m
Work = 980 J
Therefore, the work done by the normal force is 980 Joules.