Question

How to get the answer?

Answer 1

first go with differentiation-

$s = {t}^{2} \\ \frac{ds}{dt} = 2t$

since, Velocity is not constant so it is non uniform circular motion.

In non uniform circular motion

◆acceleration (a) is-

$a = \sqrt{ { (\frac{ ({v}^{2}) }{r} )}^{2} + { (\frac{dv}{dt} )}^{2} } \\ \\ since \: v = 2t \\ \frac{dv}{dt} = 2 \\ put \: all \: in \: the \: equation \: of \: a$

dv/dt=2

and v=2t=2×2=4 (since t=2)

r=2 as given.

Hope it will help you!!