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Question
An object of mass 150 g is moving with a speed of 30 m s−1. It is brought at rest by an external force in 0.5 seconds . Find the magnitude of change in the momentum of the object.
An object of mass 150 g is moving with a speed of 30 m s−1. It is brought at rest by an external force in 0.5 seconds . Find the magnitude of change in the momentum of the object.
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Solution
The correct option is D 4.5 kg m s−1
Given, the mass of the object, m = 150 g=1501000=0.15 kg
Let the initial speed at which the object moves be u = 30 m s−1
Let the final speed of the object be v = 0 (since the object is brought at rest)
We know that, Initial momentum = m×u=0.15×30=4.5 kg m s−1
Final momentum of the object = m×v=0.15×0=0
Change in momentum is given by:
Final momentum- Initial momentum
=0−4.5=−4.5 kg m s−1
Therefore, change in momentum of the object is 4.5 kg m s−1.
Given, the mass of the object, m = 150 g=1501000=0.15 kg
Let the initial speed at which the object moves be u = 30 m s−1
Let the final speed of the object be v = 0 (since the object is brought at rest)
We know that, Initial momentum = m×u=0.15×30=4.5 kg m s−1
Final momentum of the object = m×v=0.15×0=0
Change in momentum is given by:
Final momentum- Initial momentum
=0−4.5=−4.5 kg m s−1
Therefore, change in momentum of the object is 4.5 kg m s−1.
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