Question

(a) Define momentum of a body. On what factors does the momentum of a boay depends
(b) Calculate the change in momentum of a body weighing 5 kg when its velocity
decreases from 20 m/s to 0.20 m/s.​

Answer 1

Answer:

Momentum

Explanation:

Momentum see below

for ex

ur observing an ball and u look away and back there if the object is at somewhere else then that's momentum

Answer 2

Answer- The above question is from the chapter 'Force and Laws of Motion'.

Let's know about momentum first.

Momentum: It is the product of mass (m) and velocity $\vec{v}$.

It is denoted by $\vec{p}$.

$\vec{p} = m \times \vec{v}$

It is a vector quantity i.e. it possesses magnitude as well as direction.

Its S.I. unit is Kg m/s.

Change of momentum = Change in final momentum - Change in initial momentum

$\triangle{p} = p_{f} - p_{i}\\\triangle{p} = m\vec{v} \: - m\vec{u}$

Here, Δp = Change in momentum

$p_{i}$ = Initial momentum

$p_{f}$ = Final momentum

Given question: (a) Define momentum of a body. On what factors does the momentum of a body depends?

(b) Calculate the change in momentum of a body weighing 5 kg when its velocity decreases from 20 m/s to 0.20 m/s.

Answer: (a) Momentum: It is the product of mass (m) and velocity $\vec{v}$.

Momentum of a body depends upon two factors:

(i) Mass of the body (m)

(ii) Velocity acquired by the body ($\vec{v}$)

(b) Mass of the body (m) = 5 Kg

Initial velocity (u) = 20 m/s

Final velocity (v) = 0.20 m/s

Change in velocity = v - u = 20 - 0.20 = 19.8 m/s

Change in momentum = mv - mu

Change in momentum = m (v - u)

Change in momentum = 5 × 19.8

Change in momentum = 99 Kg m/s