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3. a) Pick out the two scalar quantities in the following lists. Force, angular momentum, work, current, linear momentum, electric field, Velocity, magnetic moment b) The position of the particle is given by r= 3ti-2t2j+4k where t is in second i) Find v & a of the particle ii) Give the magnitude &direction of velocity of the particle at t=2 s?

3.a) current , electric field.

b) r= 3ti-2t2j+4k
    

therefore v=dr/dt
                   =3i+4tj m/s

                a=d2r/dt2 =dv/dt
                  =4jm/s2
c) at t=2s

          v=3i+8j m/s

          a=4j m/s2


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