A ball thrown vertically upwards after reaching a maximum height h returns to the starting point after a time of 10 s. Its displacement after 5 s is

Options

A. h
B. 2h
C. 10h
D. 20h

Answer

A

Explanation

The position of an object is always expressed w.r.t. some refrence point. If the initial position of an object w.r.t. a reference points is `s_(1)` and after sometime, it changes to `s_(2)`, then the magnitude of the displacement of the object is `s_(2)-s_(1)`. If the value of `s_(2)` is greater than `s_(1)`, then the displacement is positive, but if the value of `s_(2)` is less than `s_(1)`, then the displacement is negative. So, its displacement is zero `(because s_(1)=s_(2)=h)`