Question

A force of 8 n acting on a particle increases its velocity from 5 m/s to 7 m/s in 2s. then the mass of the particle is ______
a) 12kg
b) 0.12 kg
c) 8kg
4) 120 kg​

Answer 1

Answer:

8 kg

Explanation:

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Answer 2

Given:-

→ Force acting = 8 N

→ Initial velocity of the particle = 5 m/s

→ Final velocity of the particle = 7 m/s

→ Time taken = 2s

To find:-

→ Mass of the particle.

Solution:-

By Newton's 2nd law of motion, we know that :-

F = m(v - u)/t

Where :-

• F is the force acting.

• m is mass of the particle.

• v is final velocity of the particle.

• u is initial velocity of the particle.

• t is time taken.

Substituting values, we get :-

=> 8 = m(7 - 5)/2

=> 8 = m(2)/2

=> 8 = 2m/2

=> m = 8 kg

Thus, mass of the body is 8kg [Option.c]

Some Extra Information:-

2nd law of motion : Rate of change of momentum is difectly proportional to the force applied and it takes place in the direction of force.

i.e. F ∝ m(v - u)/t