The table shows the time taken for $30$ oscillations by four different pendulums.

	Pendulum $1$	Pendulum $2$	Pendulum $3$	Pendulum $4$
Time taken for $30$ oscillations	$48 \mathrm{s}$	$54 \mathrm{s}$	$45 \mathrm{s}$	$52 \mathrm{s}$

Which pendulum has the shortest time period?

Anju walks $8 \mathrm{m}$ to the east, then $6 \mathrm{m}$ to the south, then $8 \mathrm{m}$ to the west, and finally $6 \mathrm{m}$ to the north. What is the distance covered and displacement of Anju?

The diagram shows a strip of paper tape that has been pulled under a vibrating arm by an object moving at constant speed. The arm is moving regularly, making $50$ dots per second.

What was the speed of the object? 

Suppose the two photographs, shown in Fig.1 and Fig. 2, had been taken at an interval of $10 \mathrm{seconds}$. If a distance of $100 \mathrm{m}$ is shown by $1 \mathrm{cm}$ in these photographs, calculate the speed of the blue car.

$36 \mathrm{km}/\mathrm{h} = \mathrm{\_\_\_\_} \mathrm{m}/\mathrm{s}.$

A bus covers a distance of $250 \mathrm{k}\mathrm{m}$ from Delhi to Jaipur in $5 \mathrm{h}$ and returns to Delhi in $4 \mathrm{h}$. If the average speed is $X$ $\mathrm{km}/\mathrm{hr}$ then find  the value of $X$ by rounding off to two decimal places.