A ball has a mass of 0.5kg dropped from a clifftop, the ball strikes the sea below at a velocity of 10m/s. (a)what is the kinetic energy of the ball as it strikes the sea?
(b) what was its potential energy before it was dropped?
(c) from what height was it dropped?
d) A stone of mass 1kg also hits the sea at 10m/s. Repeat stages a, b and c above to find the height from which the stone was dropped.

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

conduct current i mean it makes sense