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Balanced and Unbalanced Forces

Identify from...

Question

Identify from the following, the case where balanced force acts on it.

m₁v₁ + m₂v₂m₁v₁ + m₂v₂

A

A lorry travelling at a variable speed on a straight road.

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B

A car that has a deceleration of 10 m/s²

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C

A cyclist braking.

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D

A person resting on an armchair.

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Solution

The correct option is D
A person resting on an armchair.

A person in the armchair is at rest, not moving. Hence, the forces are balanced.

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