Question

A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain? (g = 9.8 m/s2)

Answer 1

WORK = MASS × GRAVITATION × HEIGHT

WORK = 100 × 50 × 9.8

WORK = 49,000 JOULE

$\huge\bold\orange{THANKS}$

Answer 2

Given:

• Mass,m = 50 kg

• Height,h = 100 m (distance, d)

• Acceleration due to gravity, g = 9.8 m/s²

To be Calculated:

(i)Calculate the amount of work done by him.

(ii)How much potential energy does he gain?

Formula Used:

• Force ,F = m × g

• Work ,W = F × d

• Potential energy, P.E = m × g × h

Solution:

(i) F = m × g

= 50 × 9.8

= 50 × 98/10

= 490 N

Now,

Work = F × d

= 490 × 100

= 49000 J

(ii)P.E = m × g × h

= 50 × 9.8 × 100

= 50 × 98/10 × 100

= 49000 J

P.E = Work = 49000 J