Question

A body of mass 20g is moving a 5m/s. If the
velocity to increase to 25 m/s, find the change in
momentum.​

Answer 1

Answer: 0.4 kg m/s.

Given:

Mass (m) = 20 g = 0.02 kg

Initial Velocity (u) = 5 m/s

Final velocity (v) = 25 m/s    

To find:

Change in momentum.

Explanation:

We know that,

Change in momentum (p) = Mass × Change in velocity

p = m×(v-u)

Substituting the values, we get

p = 0.02×(25-5)

  =0.02×20

  =0.4 kg m/s

Therefore, the change in momentum is 0.4 kg m/s.

More to know:

Momentum is the product of the mass and velocity of an object. It is a vector quantity. Its SI unit is kilogram meter per second kg⋅m/s. Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle.

Answer 2

ANSWER :-

We have to find the change in momentum of body whose mass is 20g and having velocity 5ms in starting and at final 25m/s.

For solving these problems we must know the formula of momentum

i.e

$\huge\red{\underline{{\boxed{\textbf{P = M. V}}}}}$

Where ,

p = momentum

m = mass

v = velocity

$Now, \\ \\ P(initial )= M \times V(initial) \\ \\ = > \: \frac{20}{1000} \times 5 \\ \\ = > 0.1 \: kg \ \frac{m}{s} } \\ \\ P(final) = M \times V(final) \\ \\ = > P = \frac{20}{1000} \times 25 \\ \\ = > 0.5 \: kg \frac{m}{s}$

Change in Momentum =>

P = P(final) - P(initial)

P = 0.5 - 0.1

P = 0.4 kg(m/s)

__________________

Definition of momentum :-

It can be defined as the product of the mass and velocity. Its SI unit is kilogram metre per second.