Suppose the velocity of a car at any time t is given by the equation v=60 m/s +0.50 m/s³h,
Derive an expression for the instantaneous acceleration as a function of time
​

acceleration is time derivative of speed.

When v(t) = 60 + 0.50t, is a(t) = v' (t) = 0.50 (m/s²)

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).