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 focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

dec 23, 2016 - a load of bricks weighing 680 n a distance of 10 m across a parking lot. if if the worker pushes the cart with a constant force of 209 n, what work= force x distance = 220 n x 10 m = 2200 n.m = 2200 j i don't know where the person got it from, but the initial part, work= force x distance me.