Motion and Time...

Match the situations given in column I with the possible curves in column II and select the correct option, from codes given

A rod of length/leans by its upper end against a smooth vertical wall while its other end leans against the floor. The end that leans against the wall moves uniformly downwards. Then:

In a damped oscillator, the mass of the oscillator is m = 200g, force constant is K = 90N/m and the damping constant b is 40 g/s. Find the time taken for its mecharical energy to drop to half its initial value 

Two cyclists, k km apart, and starting at the same time, would be together In r hours if they travelled in the same direction, but would pass each other In t hours if they travelled in opposite directions. The ratio of the speed of the faster cyclist to that of the slower is ____

$$a$$. A boy moving on a bicycle with a speed of $$18~ km/h$$.
$$b$$. A fast runner running with a speed of $$10 ~m/s$$.
$$c$$. A scooter moving with a speed of $$800 ~m/min$$.

When can we tell which vehicle is moving fast or slow?

Look at first figure. It shows the position of some vehicles moving on a road in the same direction at some instant of time. Now look at second figure. It shows the position of the same vehicles after some time, which vehicle is moving the fastest of all?

The faster vehicle has ______.

Which of the following is true?

How can we know which vehicle is moving faster or slower?