Please answer immediately : A body is projected vertically upwards from ground Taking air resistance into account ,then wrong - Science - Motion

Question

Please answer immediately : A body is
projected vertically upwards from ground Taking air resistance into
account ,then wrong statement among below is :
a) the time of rise to maximum
height is less than that in vacuum
b)  the time of rise
is greater than time of fall
c)  the time of rise
is less than time of fall
d)  the speed of
particle when it returns to ground is less than speed of
projection

Somnath physics · Accepted Answer

In
presence of air friction, the projectile would take less time to
reach the maximum height than to drop down from the maximum height
to the ground The initial velocity of projectile causes high air
friction, since, air friction increases with velocity So, in the
upward motion the maximum height is less than that in the case of
vacuum While falling down the velocity of the projectile increases
and the frictional force increases too If the height from which it
is falling is large, then there might be the condition of terminal
velocity also So, it follows that the time of descent must be
larger than the time of descent in presence of air friction Since,
the projectile loses some kinetic energy to the air friction, the
velocity with which it hits the ground is less than the velocity it
was projected
Thus, the
wrong statement is b