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An object of Mass 40 kg is raised to a height of 5m above the

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Class 9

NCERT

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A certain household has consumed

250 u ni t s

of energy during a month. How much energy is this in Joules?

An object of Mass

40 k g

is raised to a height of

5 m

above the ground what is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.

What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.

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Question

Easy

Solving time: 4 mins

An object of Mass $40 k g$ is raised to a height of $5 m$ above the ground what is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.

Views: 6,008 students

Updated on: Dec 17, 2023

Book:

Science (NCERT)

Found 6 tutors discussing this question

Jack Discussed

An object of Mass

40 k g

is raised to a height of

5 m

above the ground what is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.

7 mins ago

Discuss this question LIVE

7 mins ago

Text solutionVerified

Given :

Mass of the object

M = 40 k g

Height upto which it is raised

h = 5

Potential energy

P . E = M g h

P . E = 40 \times 10 \times 5 = 2000 J

Let its kinetic energy be

E_{k}

when it is half way down i.e

h^{'} = \frac{h}{2}

According to conservation of energy,

K . E_{i} + P . E_{i} = K . E_{f} + P . E_{f}

0 + 2000 = E_{k} + M g \frac{h}{2}

∴

2000 = E_{k} + 40 \times 10 \times \frac{5}{2}

⟹ E_{k} = 1000 J

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Question Text	An object of Mass $40 k g$ is raised to a height of $5 m$ above the ground what is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.
Updated On	Dec 17, 2023
Topic	Work and Energy
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 20
Upvotes	2118
Avg. Video Duration	5 min

An object of Mass $40 k g$ is raised to a height of $5 m$ above the ground what is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.

Text solutionVerified

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