Question

6 X 10 m/s.
5. A body of mass 20 g is moving at 5 m/s. If the velocity increases to 25 m/s, find the change
in momentum in SI units.
[0.4 Ns]​

Answer 1

Mass of the body (m) = 20 g = 0.02 kg

Initial velocity (u) = 5 m/s

Final velocity (v) = 25 m/s

Momentum (P) : It is defined as product mass and change in velocity

( SI unit : kg.m/s or N-s )

→ P = mΔv

→ P = m ( v - u )

→ P = (0.02) ( 25 - 5 )

→ P = (0.02) (20)

→ P = 0.4 kg-m/s

→ P = 0.4 N-s

More Info :

Momentum is a vector quantity . It has both magnitude and direction. Since momentum has a direction, it can be used to predict the resulting direction and speed of motion of objects after they collide.

Answer 2

Given : A body of mass 20 g is moving at 5 m/s. If the velocity increases to 25 m/s.

　

To find : What is the change in momentum in SI units.

　

Using formula :

★ p = m (v - u).

Know Terms :

1. Momentum = (p).
2. Mass = (m).
3. Initial velocity = (u).
4. Final velocity = (v).

　

Calculations :

→ 0.02 (25 - 5)

→ 0.02 (20)

→ 0.02 × 20

→ 0.4 N/s

　

Therefore, the change in momentum is 0.4 N/s.