Observe the vehicle moving ahead of you. When it crosses the stationary object like a tree, pole etc., then count the time (in seconds taken by you to cross the objects. If you reach before, then decrease the speed and if you reach after, then increase the speed. By which instrument will you count the seconds?
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Answer:
Stopwatch
Explanation:
Stopwatch is the instrument used to measure the time in seconds.
It contains only one buttons used to start and stop the watch.If we press the button first time then watch start and press the button again then it stops and gives the reading of time in seconds.
So,for calculating the time in the given case we used the Stopwatch.
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