Question

A body of 40 kg mass is taken to a height of 5 Metre.What is the work done? Given g=10 ms².​

Answer 1

Answer:

· Potential energy (K.E) is given by the expression, K.E = m × g × h. Where, m = Mass of the object. h = Vertical displacement. g = Acceleration due to gravity (9.8 ms -2) P.E = 40 × 9.8 × 5. P.E = 1960 J.

Estimated Reading Time: 40 secs

Explanation:

Answer 2

Answer:

980 J

Explanation:

Given:

Mass of the object = 40kg

Height = 5m

Find out:

We need to find Potential energy and also  its kinetic energy when it is half-way down

Solution

Potential energy (K.E)  is given by the expression,

K.E = m × g × h

Where,

m = Mass of the object

h = Vertical displacement

g = Acceleration due to gravity  (9.8 ms-2)

P.E = 40 × 9.8 × 5

P.E = 1960 J

At half-way down, the Kinetic energy of the item:

At this time, the item has an equal quantity of potential and K.E.

This can be due to law of conservation of energy. Hence, half-way down, the K.E. of the object can be calculated as

1960 J/ 2

⇒ 980 J

half way down = 980 J

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