**Answer**

**i'm not 100% sure but 1764**

**Explanation:**

Work done = gravitational potential energy

Gravitational potential energy = mass(kg) × height(m) × gravitational field strength(N/kg)

We can assume that the student is on earth so the gravitational field strength is 9.8N/kg

So work done = 60 × 3×9.8

=1764

(if you need help calculating power but if you do just divide your answer by 12 and you will get 147)

You can't keep cutting because the object will be gone

When it travels 3m ,4m and 5m it means 12m is right answer.