A driver of a car travelling at $52\, km\, h^{-1}$ applies the brakes and accelerates uniformly in the opposite direction. The car stops in $5\, s$. Another driver going at $3 \,km \,h^{-1}$ in another car applies his brakes slowly and stops in $10\, s$. On the same graph paper, plot the speed versus time graphs for the two cars. Which of the two cars travelled farther after the brakes were applied ?

A bus decreases its speed from $80\, km\, h ^{-1}$ to $60 \,km\, h ^{-1}$ in $5\, s$. Find the acceleration(in $m / s ^{2}$) of the bus.

A stone is thrown in a vertically upward direction with a velocity of $5\, m s^{-1}$. If the acceleration of the stone during its motion is $10\, m s^{-2}$ in the downward direction, what will be the height attained by the stone and how much time will it take to reach there ?

A train starting from a railway station and moving with uniform acceleration attains a speed $40\, km \,h^{-1}$ in $10$ minutes. Find its acceleration(in $m / s ^{2}$).

The speed-time graph for a car is shown is Fig.

$(a)$ Find how far does the car travel in the first $4,sec$. Shade the area on the graph that represents the distance travelled by the car during the period.

$(b)$ Which part of the graph represents uniform motion of the car ?