A frog leaps vertically into the air and encounters no appreciable air resistanc

Question

A frog leaps vertically into the air and encounters no appreciable air resistance. Which statement about the frog's motion is correct?        A) Both on the way up and on the way down its acceleration is 9.8 m/S2 upward, and at the highest point its acceleration is zero.
       B) Both on the way up and on the way down and at the highest point, its acceleration is 9.8 m/S2 downward.
       C) Both on the way up and on the way down its acceleration is 9.8 m/S2 downward, and at the highest point its acceleration is zero.
       D) On the way up, its acceleration is 9.8 m/S2 upward, and on the way down its acceleration is 9.8 m/S2 downward.
       E) On the way up, its acceleration is 9.8 m/S2 downward, and on the way down its acceleration is 9.8 m/S2 upward. Question 4.A ball thrown horizontally from the top of a building hits the ground in 3.0 s. If it had been thrown with three times the speed in the same direction, it would have hit the ground in        A) 1.0 s.
       B) 3.0 s.
       C) 9.0 s.
       D) 6.0 s.
       E) 1.5 s. A frog leaps vertically into the air and encounters no appreciable air resistance. Which statement about the frog's motion is correct?        A) Both on the way up and on the way down its acceleration is 9.8 m/S2 upward, and at the highest point its acceleration is zero.
       B) Both on the way up and on the way down and at the highest point, its acceleration is 9.8 m/S2 downward.
       C) Both on the way up and on the way down its acceleration is 9.8 m/S2 downward, and at the highest point its acceleration is zero.
       D) On the way up, its acceleration is 9.8 m/S2 upward, and on the way down its acceleration is 9.8 m/S2 downward.
       E) On the way up, its acceleration is 9.8 m/S2 downward, and on the way down its acceleration is 9.8 m/S2 upward.

Explanation / Answer

part a)

statement 'B' is correct

       B) Both on the way up and on the way down and at the highest point, its acceleration is 9.8 m/S2 downward.

part b)

given top ground hits in 3s

and it thrown 3 times wit speed in same direction

then time directly proportional to speed

then t1 / t2 = V2 / V1

3 / t2 = 3/ 1

t2 = 1 sec

answer ' A ' is correct

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