First slide

Errors

Question

If air resistance opposes the motion of a vertically projected body then its time of ascent $T_{a}$ and time of descent $T_{d}$ then

Easy

A

$T_{a} = T_{d}$
B

$T_{a} > T_{d}$
C

$T_{a} < T_{d}$
D

depends on value of the air resistance.

Solution

while the body is going up along with gravitational force resistive force also opposes the motion hence the effective retardation increases time of ascend decreases where as while going downward gravitational force support the motion where as the resistive force opposes the motion effective acceleration decreases time of descend increases.

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