First slide

Second law

Question

The force F acting on a particle of mass m is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8s is

Moderate

A

24 N s
B

20 N s
C

12 N s
D

6 N s

Solution

Change in momentum = Area under F-t graph in that interval = Area of $∆$ ABCD - Area of rectangle CDEF + Area of rectangle FGHI

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