A diver of mass 10 kg drops from a board 10.0 m above the water’s surface. Neglect air resistance. a. Find its speed 5.0 m above the water surface

b. Find his speed as he hits the water. Use conservation of mechanical energy

c. Calculate the kinetic energy when he hits the water surface?

d. Calculate the potential energy at the initial height?

e. Based on your results, record your data in the table below and explain your observation
KE PEg
y=10 m .
y=5m .
y=0m

i think the answer would be b

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

it is b. absorbs thermal energy