Question

first body is in rest what is the momentum second body has a mass of 20 g and moves with a velocity of 10 M/s what is the momentum​

Answer 1

Solution:

Provided that: 2 bodies are given.

• 1st body is at rest.

• 2nd body have

• Mass, 20 g
• And velocity, 10 m/s

To calculate:

• The momentum

Solution:

• Momentum (1st body) = 0 kg m/s

• Momentum (2nd body) = 0.2 kg m/s

Knowledge required:

• Momentum SI unit = kg m/s
• Velocity SI unit = m/s
• SI unit of mass = kg

Using concepts:

• Momentum formula
• Formula to convert g-kg

Using formulas:

• ${\small{\underline{\boxed{\pmb{\sf{p \: = mv}}}}}}$

• ${\small{\underline{\boxed{\pmb{\sf{1 \: g \: = \dfrac{1}{1000} \: kg}}}}}}$

Where, p denotes momentum, m denotes mass and v denotes velocity

Required solution:

~ Firstly let us find out the momentum of first body!

Explanation: As the body is at rest therefore, it's velocity is zero and let it have mass as m.

Henceforth, by using formula we get,

→ Momentum = Mass · Velocity

→ p = mv

→ p = m(0)

→ p = 0 kg m/s

→ Momentum = 0 kg m/s

~ Now let's find out the momentum of second body before that let us convert g into kg!..

$:\implies \sf 1 \: g \: = \dfrac{1}{1000} \: kg \\ \\ :\implies \sf 20 \: g \: = \dfrac{20}{1000} \\ \\ :\implies \sf 20 \: g \: = \dfrac{2}{100} \\ \\ :\implies \sf 20 \: g \: = 0.02 \: kg \\ \\ {\pmb{\sf{Henceforth, \: converted!}}}$

→ Momentum = Mass · Velocity

→ p = mv

→ p = 0.02(10)

→ p = 0.2 kg m/s

→ Momentum = 0.2 kg m/s