5. Extension 1: The formula for potential energy is PE = m. g.h. In this formula energy (in joules), m stands for mass (in kilograms), h stands for height (in me
acceleration caused by gravity. On Earth's surface, g is 9.8 m/s2. This means
of a falling object increases by 9.8 m/s.
Calculate the potential energy of a 20-kg sled at 40 meters. / Show
your work

glass has been rated on the mohs scale as 5.5

the answer is b i think

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

a 2,000 calorie based diet.