Answer:
1,050 Joules
Step-by-step explanation:
Step 1: work done in moving the box 30 meters
work done = force X distance
= 25N X 30 = 750 Joules
Step 2: calculate total internal energy
Total internal energy = work done + kinetic energy
= 750 Joules + 300 Joules
= 1,050 Joules = 1.05 KJ