Question

Calculate the momentum of a ball of mass 450g movie with a speed of 120km/h

Answer 1

Given :-

• Mass (m) = 450 g
• Velocity (v) = 120 km/h

To find :-

• Momentum (P) = ?

Solution :-

• Firstly, convert mass from g into kg.

As we know,

• $\sf{1~kg~=~\dfrac{1}{1000}g}$

• Divide 450 by 1000.

• Mass = 0.45 kg

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• Secondly, convert the velocity from km/h into m/s

• To convert from km/h to m/s. Divide the given value by 5/18

• Velocity = 120 × 5/18

Momentum (P) = mass (m) × velocity (v)

$\implies$ 0.45 × 120 × 5/18

$\implies$ 15 m/s

• Momentum = 15 m/s

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Know more :-

Velocity :-

• The distance travelled by a body in one second in a particular direction is called velocity.
• It is a vector quantity.
• Its S.I. unit is m/s.

Momentum :-

• The instantaneous force possessed by a body due to the combined effect of mass and velocity.
• It is a vector quantity.
• Its S.I. unit is Ns.

Answer 2

Given :-

• Mass (m) = 450 g

• Velocity (v) = 120 km/h

To find :-

• Momentum (P) = ?

Solution :-

• Convert mass from g into kg.

As we know,

$\sf{1~kg~=~\dfrac{1}{1000}g}$

• Mass = 0.45 kg

• Convert the velocity from km/h into m/s

To convert from km/h to m/s. Divide the given value by 5/18

• Velocity = 120 × 5/18

Momentum (P) = mass (m) × velocity (v)

⟹ 0.45 × 120 × 5/18

⟹ 15 m/s

• Momentum = 15 m/s

_____________________________

Velocity :-

• The distance travelled by a body in one second in a particular direction is called velocity.
• Its S.I. unit is m/s.

Momentum :-

• The instantaneous force possessed by a body due to the combined effect of mass and velocity.
• Its S.I. unit is Ns.