This question was previously asked in

DSSSB TGT Natural Science Male Subject Concerned - 29 Sept 2018 Shift 2

Option 4 : 85 kg

General Awareness Sectional Test 1

13118

40 Questions
40 Marks
15 Mins

__Concept__**:**

**Potential energy**is defined as the**energy stored due to change in position relative to others**, stresses within itself, or many factors.- The
**potential energy (U) = m g h**[where m= mass of body, g= acceleration due to gravity, h = distance from the ground]. - If the
**height of a body increases**from the ground**its energy also increases**and vice versa.

- The

__Calculation:__

Work-done to carry a box up to height = m g h

Here the person himself do work on his own mass + mass of box

Let the mass of the person be x

So,

**Work-done by potential energy = mass (both) × g × height**

⇒ 5000 J = (x kg + 15 kg) × 10 × 5

⇒ 5000 = (x+15) × 50

⇒ 100 = x + 15

⇒ x = 85 kg

__Hence the mass of the person is 85 kg.__