A body of mass 10 kg is moving in a straight line. Its velocity decreases from 5 m/s to 3 m/s in a time of 2 s. The change of momentum of the particle, in kg m/s, in the direction of motion isĻ
what is m(changevelocity)?
To find the change in momentum of the body, we first need to calculate the initial momentum and the final momentum.
The momentum of an object is given by the equation:
Momentum = mass × velocity
So, to find the initial momentum, we can multiply the mass of the object (10 kg) by its initial velocity (5 m/s):
Initial momentum = 10 kg × 5 m/s = 50 kg m/s
Similarly, we can find the final momentum by multiplying the mass (10 kg) by the final velocity (3 m/s):
Final momentum = 10 kg × 3 m/s = 30 kg m/s
Now, to find the change in momentum, we subtract the initial momentum from the final momentum:
Change in momentum = Final momentum - Initial momentum
Change in momentum = 30 kg m/s - 50 kg m/s
Change in momentum = -20 kg m/s
The negative sign indicates that the change in momentum is in the opposite direction of the motion. Therefore, the change in momentum of the particle in the direction of motion is -20 kg m/s.