9th Class
Science
Force and laws of motion
Question Bank
Force and Laws of Motion
question_answer
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 8 s is
A)24 N s
B) 20 N s
C) 12 N s
D) 6 N s
Correct Answer:
C
Solution :
Change in momentum = Area under F-t graph in that interval = Area of \[\Delta ABC-\] Area of rectangle CDEF + Area of rectangle FGHI \[=\frac{1}{2}\times 2\times 6-3\times 2+4\times 3=12Ns\]