1. A ball rolling down a ramp accelerales from 0 cm/s to 40 cm/s in 10 seconds. What is ils acceleralion?

4 cm/s².

Explanation:

From the question given above, the following data were obtained from it:

Initial velocity (u) = 0 cm/s

Final velocity (v) = 40 cm/s

Time (t) = 10 s

Acceleration (a) =?

Acceleration is simply defined as the rate of change of velocity with time. Mathematically, it is expressed as follow:

Acceleration (a) = Change in velocity /time

Acceleration (a) = [final velocity (v) – initial velocity (u)] /time (t)

a = (v – u) /t

With the above formula, we can obtain the acceleration of the ball as follow:

Initial velocity (u) = 0 cm/s

Final velocity (v) = 40 cm/s

Time (t) = 10 s

Acceleration (a) =?

a = (v – u) /t

a = (40 – 0) / 10

a = 40/10

a = 4 cm/s²

Therefore, the acceleration of the ball is 4 cm/s²

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.