Acceleration

A bus can accelerate with an acceleration $1 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$. Find the minimum time for the bus to reach the speed of $100 \mathrm{km}/\mathrm{s}$ from $50 \mathrm{km}/\mathrm{s}$.

Note: This question given in the book seems to have errors and the modified question should be as given below.

A bus can accelerate with an acceleration $1 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$. Find the minimum time for the bus to reach the speed of $100 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ from $50 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$.

A car started from rest and travelling with a velocity of $20 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ in $10 \mathrm{s}$. What is its acceleration?

What do you mean by constant acceleration?

$\mathrm{Displacement}/\mathrm{Time}$: Velocity:: $\mathrm{Speed}/\mathrm{Time}$: _____.

If the velocity of an object increases with respect to time, then the object is said to be in _____ acceleration.

Choose from the bracket (positive/negative/zero).

The rate of change of velocity is _____.

Suppose a boy is riding on a merry-go-round which is moving with a constant speed of $10 \mathrm{m}/\mathrm{s}$. It implies that the boy is