Qno. 13 plz explain the answer in detail
Q.113. A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
(a) equal to the time of fall
(b) less than the time of fall
(c) greater than the time of fall
(d) nothing can be decided

Dear Student ,
Time of ascent be t seconds and the object be thrown with an initial velocity be u m/s.

Descent:

Time of descent be t' seconds and the object final velocity be v m/s. The distance covered will be the same as when the object is thrown upwards.

From equation (1) and (2) we can see that u = v.

t' = t, that is, time of ascent is equal to time of descent.
So the correct option is (a) .
Hope this helps you .
Regards