Question

The velocity of a 2 kg object is increased from 2.0 m/s to 4.0 m/s by a constant force. Find the change in momentum of the object.​

Answer 1

Given:

• Mass (m) = 2 kg
• Initial velocity (u) = 2 m/s
• Final velocity (v) = 4 m/s

To find:

• Change in momentum = ?

Solution:

We know, Momentum (p) = mass (m) × velocity (v)

So, the change in momentum = p2 - p1

i.e, change in momentum = mv - mu = m(v - u).

(put the given values)...

$= = > \: 2 \times 4 \: - \: 2 \times2$

$= = > \: 8 \: - \: 4$

$= = > \: 4 \: kg \: \frac{m}{s}$

Hence, the change in momentum of the body is 4 kg m/s.

_____________________________

Let's know more !

• Acceleration is the rate of change of velocity i.e, a = (v-u)/t. SI unit is m/s^2.
• Distance is the actual path covered by any body. SI unit is metre.
• Displacement is the shortest path between the initial and final point. The SI unit is metre.

Hope it helped you dear...