Question

the position of a particle is given by r=3ti^+2tj^+5k^where r is in m and t is in second. Find v (t) and (t) of the particle
Find the magnitude and direction of the v (t) at t=1s

Answer 1

$we \: know \: that \: \binom{dx}{ dt} = v \\ so \: here \: dr \div dt = v = 3i \: + 2j \\ mgnitude = \sqrt{13}$

Answer 2

mgnitude = \sqrt{13}

I think so