Q9 of 42 Page 29

A car of mass m starts from rest and acquires a velocity along east v = vî (v > 0) in two seconds. Assuming the car moves with uniform acceleration, the force exerted on the car is

Car start from rest mean initial velocity u=0, also and t=2s mass is given as m.

As we know so


Now force exerted on the car i.e. here this force is due to engine of car so whatever this force is actually internal force in another words due to friction force the car moves in eastward direction.


Therefore, option (b) is correct.

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7

A body of mass 2kg travels according to the law x(t) = pt + qt2 + rt3

Where p = 3 m s-1, q = 4 m s-2 and r = 5 m s-3.


The force acting on the body at t = 2 seconds is


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A body with mass 5 kg is acted upon by a force F = (-3î+ 4ĵ) N. If its initial velocity at t = 0 is v = (6î - 12ĵ) m s-1, the time at which it will just have a velocity along the y-axis is

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In Fig. 5.1, the co-efficient of friction between the floor and the body B is 0.1. The co-efficient of friction between the bodies B and A is 0.2. A force F is applied as shown on B. The mass of A is m/2 and of B is m. Which of the following statements are true?