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Q.

The linear momentum of a body moving in one dimension varies with time according to the equation P=a+bt2, where a and b are positive constants. The net force acting on the body is   

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a

A constant

b

Proportional to t2

c

Proportional to t

d

Inversely proportional to t

answer is B.

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Detailed Solution

P=a+bt2

F=dpdt

F=ddt(a+bt2)

F=0+2bt

F=2bt

y=mx

Force is directly proportional to time (t)

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