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NEET2012PhysicsMotion in One DimensionActual

A particle has initial velocity (2 i +3 j ) and acceleration (0.3 i +0.2 j ) . The magnitude of velocity after 10 ~s will be

Options

  1. A9 2 units
  2. B5 2 units
  3. C5 units
  4. D9 units

Correct answer

B. 5 2 units

Step-by-step solution

( aligned & Here, u =2 i +3 j , & a =0.3 i +0.2 j , t=10 ~s & As v = u + a t & v =(2 i +3 j )+(0.3 i +0.2 j )(10) & =2 i +3 j +3 i +2 j =5 i +5 j & | v |= (5)^2+(5)^2 & =5 2 units aligned )

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