Question

If retardation produced by air resistance to the particle is one-tenth of acceleration due to gravity, the time to return from the maximum height:

(A) increases by 9%
(B) decreases by 9%
(C) increases by 11%
(D) decreases by 11%​

Answer 1

Answer:

(C)

Explanation:

t = u/g(effective)

t°=u/g [without air resistance]

t'=u/(g-g/10)

t'=10u/9g

.

t'/t°=10u * g/9g*u = 10/9

t'=10t°/9

∆t {t'-t°}= +11%