State whether the following statement is true or false:
$A$ quantity which can be represented completely by magnitude alone is called a vector quantity.

The graph given below is the distance-time graph of an object.
$(i)$ Find the speed of the object during the first four seconds of its journey.
(ii) How long was it stationary?
(iii) Does it represent a real-life situation? Justify your answer.

The area under the velocity$-$time graph gives the value of

From the given $v-t$ graph (Fig.),it can be inferred that the object is

State whether the following statement is true or false:
Acceleration is defined as the rate of change of velocity.

The average time taken by a normal person to react to an emergency is $1/15$ of a second and is called the 'reaction time'. If a bus is moving with a velocity of $60 \, km/h$ and its driver sees a child running across the road,how much distance would the bus have moved before he could press the brakes? The reaction time of the people increases when they are intoxicated. How much distance would the bus have moved if the reaction time of the driver were $1/2 \, s$ under the influence of alcohol?