Which statement best compares potential and kinetic energy?
objects always have more potential energy than kinetic energy.
only kinetic energy increases when the velocity of an object increases.
only potential energy decreases when an object's height increases.
objects always have more kinetic energy than potential energy.
mark this and retum
submit

Only kinetic energy increases when the velocity of an object increases.

Explanation:

That's the correct option because kinetic energy is proportional to velocity squared and potential energy is proportional to object's height.

First and last option are incorrect because objects can either have more kinetic energy or potential energy depending on the circumstances.

Third option is incorrect. The correct version of it is: Only potential energy decreases when an object's height decreases.

force tends to be low and long diustance masses are high

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