Question

A boy of mass 40kg while running develops a momentum of 180Ns. Calculate the velocity of the boy​

Answer 1

Answer:

$\boxed {\boxed {\sf v= 4.5 \ m/s}}$

Explanation:

The formula for momentum is:

$p=mv$

(p is momentum, m is mass, and v is velocity)

Let's rearrange the formula for velocity, or v.

$\frac{p}{m} =v$

Velocity can be found by dividing the momentum by the mass.

The momentum is 180 kilograms meter per second. The mass of the boy is 40 kilograms.

$p=180 \ kg*m/s \\m=40 kg$

Substitute the values into the formula.

$v=\frac{180 \ kg*m/s}{40 \ kg}$

Divide. Note that the kilograms or "kg" will cancel each other out.

$v=\frac{180 \ m/s}{40 }$

$v= 4.5 \ m/s$

The velocity of the boy is 4.5 meters per second.