Question

6. The momentum of a body of mass 20 kg and moving with a velocity 4 ms is:
a) 80 Ns
b) 5 Ns
c)0.2 Ns
d)100 NS​

Answer 1

Given :

Mass of body = 20 kg

Velocity of body = 4 m/s

To Find :

Momentum of the body.

Solution :

❖ Momentum is measured as the product of mass and velocity$.$

• It is a vector quantity having both magnitude as well as direction.
• It can be positive, negative or zero.
• SI unit : N s
• CGS unit : dyne s
• Dimension formula : [M¹L¹T‾¹]

Formula : p = m v

» p denotes momentum

» m denotes mass

» v denotes velocity

By substituting the given values;

➙ p = m v

➙ p = 20 × 4

➙ p = 80 N s

∴ (A) is the correct answer!

Answer 2

Answer:

Question

The momentum of a body of mass 20 kg and moving with a velocity 4 ms is:

Given

mass= 20 kg

velocity= 4 m/sec

To find

momentum

Solution

↝Momentum is defined as product of mass and velocity of the body.

↝It is a vector quantity. Its has both magnitude and direction.

↝momentum's S.I unit : kg.m/sec

$\boxed {\underline{p = m.v}}$

where

p= momentum

m= mass

v= velocity

put the value in the above formula of Momentum

➝p= 20× 4

➝p= 80 kg. m/sec

therefore option a) 80Ns is correct

------------------------------------------------