Question

Naresh having own mass of 40kg climbs 20m along with 20kg of bagpack on his shoulders in 40s. Calculate his power and work done.

• A. 30 W
• B. 300 W
• C. 15 W
• D. 150 W

Answer 1

The correct option is B

300 W

Total mass which Naresh is carrying = 40+20 = 60 kg,

height = 20m and

time = 40s

Work done against the gravity is = mgh = 60 × 10 × 20 = 12000J = 12 KJ

Power = $\frac{workdone}{time}$ = $\frac{12000}{40}$ = 300W