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JEE Main2009PhysicsMotion in One DimensionActual

A particle has an initial velocity 3 i +4 j and an acceleration of 0.4 i +0.3 j . Its speed after 10 s is

Options

  1. A10 units
  2. B7 2 units
  3. C7 units
  4. D8.5 units

Correct answer

B. 7 2 units

Step-by-step solution

aligned u & =3 i +4 j ; a =0.4 i +0.3 j u & = u + a t & =3 i +4 j +(0.4 i +0.3 j ) 10=3 i + j +4 i +3 j =7 i +7 j aligned Speed is 7^2+7^2 =7 2 units

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