Answer to Question #305601 in Mechanics | Relativity for jon

Question

2. A summersault swimmer stands on a high platform jumps vertically upward with a velocity of magnitude 2.5 m/s. Air resistance maybe ignored.

a.) At what time after moving from the platform does the swimmer have a velocity of 0.25 m/s upward?

b.) At what time does she has a velocity of 0.25 m/s downward?

c.) When is the displacement of the swimmer from its initial position zero?

d.) When is the velocity of the swimmer zero?

e.) What are the magnitude and direction of the acceleration while the swimmer is

i.) Moving upward?

ii.) Moving downward?

Answer 1

a)

$t_1=0.6~s,$

b)

$t_2=1.2~s,$

c)

$t_3=0.9~s,$

d)

$t_4=1.2~s,$

e)

$a=g=9.8~\frac m{s^2}.$