What is SI unit of acceleration?

What is the acceleration of a body moving with uniform velocity?

(a) Uniform acceleration and non-uniform acceleration.

Positive acceleration and negative acceleration.

A bus decreases its speed from $80 \mathrm{km}/\mathrm{h}$ to $60 \mathrm{km}/\mathrm{h}$ in $5 \sec$. Find the acceleration of the bus.

 Find the initial velocity of a car which stops in $\mathrm{}$ 10 \sec $$ after applying brakes at the rate of $\mathrm{}$ 2 \mathrm{m}/{\mathrm{s}}^2${\mathrm{}}^{}$.