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AIIMS2011PhysicsMotion in One Dimension

A 0.2 ~kg object at rest is subjected to a force (0.3 i -0.4 j ) N . What is the velocity after 6 ~s ?

Options

  1. A(9 i -12 j )
  2. B(8 i -16 j )
  3. C(12 i -9 j )
  4. D(16 i -8 j )

Correct answer

A. (9 i -12 j )

Step-by-step solution

Here, m=0.2 ~kg , u=0 aligned & F =(0.3 i -0.4 j ) & v =?, t=6 ~s & a = F m = (0.3 i -0.4 j ) 0.2 = ( 3 2 i -2 j ) aligned From v = u + a t v =0+ ( 3 2 i -2 j ) 6=9 i -12 j

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