Write true or false for the following statements

A quantitv which can be represented completely by magnitude alone is called a vector quantity.

The branch of Physics which deals with the motion of objects while taking into consideration the cause of motion is

Give an expression for the speed of an athlete if he takes time $'t^{\prime}$ to go around a circular track, of radius ${ }^{\prime} r^{\prime}$

The following table shows the positive of Renu, while she is going to her school. Draw distance$-$time graph for her motion.

$(a)$ Draw velocity-time graph for the following cases

$(i)$ When the object is at rest.

$(ii)$ When the object is thrown vertically upwards.

$(b)$ A motorcyclist riding motorcycle $A$ who is travelling at $36\, km h^{-1}$ applies the brakes and stops the motorcycle in $10\, s$. Another motorcyclist of motorcycle $B$ who is travelling at $18\, km h^{-1}$ applies the brakes and stops themotorcycle in $20\, s$. Plot speed-time graph for the two motorcycles. Which of the two motorcycles travelled farther before it come to a stop ?