Question

: A ball is rolling at a velocity of 5.0 m.s with a momentum of 20 kg-m/s. What is its mass *

Answer 1

Answer:

4 kg is the mass

Explanation:

we know momentum= mass*velocity

given momentum= 20 kg-m/s     and velocity= 5.0 m/s

 so mass= momentum/velocity

              = 20 / 5

              = 4 kg

Answer 2

Answer :-

Mass of ball = 4 kg

Step-by-step explanation :-

Momentum of an object is a vector quantity and can be written as:

p = mv

where,

• p is the momentum = 20 kg m/s
• m is the mass of body = ?
• v is the velocity with which the object is moving = 5 m/s

Note that:

★ S.I unit of momentum → kg m/s

★ S.I unit of mass → kg

★ S.I unit of velocity → m/s

While calculating, remember that all values should be in their respective S.I units.

Substitute the given values in the equation.

p = mv

⇒ 20 = mass × 5

⇒ 20 ÷ 5 = mass

⇒ mass = 20 ÷ 5

⇒ mass = 4 kg

∴ The mass of the ball = 4 kg