Work and Energy

A bus with a mass of 6500 kg is initially at rest. A constant force of 12000 N is applied to it, causing it to move 48 meters. What is the final velocity of the bus?

• 10 m/s

• 13 m/s

• 15 m/s

• 18 m/s

A 12000 N force is applied to a bus at an angle of 38 degrees relative to the direction of its displacement. If the bus moves 48 meters, what is the work done by this force? (cos(38°) ≈ 0.788)

• 5.76 x 10^5 J

• 4.54 x 10^5 J

• 3.55 x 10^5 J

• 7.32 x 10^5 J

A 3 kg block is subjected to a constant force of 30 N for a displacement of 4 meters. How much work is done on the block during this displacement?

• 30 J

• 60 J

• 90 J

• 120 J

After a 3 kg block has been displaced 4 meters by a constant force, the applied force decreases linearly from 30 N to 0 N over the next 3 meters of displacement. How much additional work is done on the block during this 3-meter interval?

• 15 J

• 30 J

• 45 J

• 60 J