a. Mark the follllowing statements as true offalse.
i. A ball thrown vertically up takes moretime to go up than to come down.
ii. If a ball starts fallig from the position of rest, then it travels a distance of `25 m` during the third secons of tis fall.
iii. A packet dropped from a rising balloon ferst moves upwards and then moves sownward as observed by a stationary observer on the ground.
iv. In the absence of air resistance, all bodies fall on the surface of earth at the same rate.
b. Fill in the blanks.
i. When a body is thrown vertically upwards, at the highest point.........................(both belocity and accelenation are zero//only velocity is zero//ony acceleration is zero). ii. If air drag is not neglected, then which is greater: time of ascent or time of descent?
iiii. A body is projected upward. Up to the maximum height time taken will be greater to travel...................... (first half//second half).

Explanation

a. i. False, time of ascent=time of dwacent.
ii. True, `D_(n)+(a)/(2) (2n-1) =0 + (10)/(2) (2xx3-1) =25 m`
iii. True, because at the time of dropping the velocity of the packet is upward, and same as that of balloon.
iv. True, acceleration due to gravity is same for all bodies.
b. i. Only velocity is zero
ii. Time of descent
iii. Second half`.