Question

what is the momentum of a ball of mass 20g moving with velocity of 800m/s

1. 1.6 kgm/s

2. 16 kgm/s

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Answer 1

Given :

• Mass of ball, m = 20 g = 0.02 kg

• Velocity, v = 800 m/s

To find :

• Momentum, p

According to the question,

As we know,

Momentum can be defined as the product of mass and velocity.

So,

➞ Momentum = Mass × Velocity

Or,

➞ p = mv

➞ p = 0.02 × 800

➞ p = 16 kg m/s

So,the momentum is 16 kg m/s.

• Option 2) 16 kg m/s is correct.

_______________________________

Momentum :-

• SI unit is kg m/s.
• It is vector quantity.
• It is denoted as p.

Mass :-

• SI unit is kg.
• It is scalar quantity.
• It is denoted as m.

Velocity :-

• SI unit is m/s.
• It is vector quantity.
• It is denoted as v.

Answer 2

Answer:

Given :-

• A mass of ball is 20 g moving with velocity of 800 m/s.

To Find :-

• What is the momentum of a ball.

Formula Used :-

To find momentum, we know that,

$\boxed{\bold{\large{p\: =\: mv}}}$

where,

• p = Momentum
• m = Mass
• v = Velocity

Solution :-

Given :

• Mass = 20 g = $\dfrac{20}{1000}$ = 0.02 kg
• Velocity = 800 m/s

According to the question by using the formula we get,

⇒ p = 0.02 kg × 800 m/s

➠ p = 16 kg m/s

$\therefore$ The momentum of a ball is 16 kg m/s .