A37 kg child on roller skates, initially at rest, rolls 2.0 m down an incline at an angle of 17.0 degrees with the horizontal. if there is no friction between incline and skates, what is the kinetic energy of the child at the bottom of the incline?

212.12 J

Explanation:

As the child starts from rest and rolls down on the incline, the potential energy of the child decreases due to decrease in the height. This drops in potential energy appears as an increase in kinetic energy of the child as it gains speed. hence kinetic energy gained by the child at the bottom is same as the potential energy of the child at the top.

= mass of the child = 37 kg

= length of the incline surface = 2.0 m

= angle of the incline from the horizontal = 17 deg

= kinetic energy of the child at the bottom

height of the incline surface is given as

= Potential energy of the child at the top

Potential energy of the child at the top of incline is given as

Using conservation of energy

Kinetic energy at the bottom = Potential energy at the top

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.