Answer:
(a)
(b) h is the same
Explanation:
According to the law of conservation of energy:

The skier starts from rest, so
and we choose the zero point of potential energy in the end of the ramp, so
. We calculate the final speed, that is, the speed when the skier leaves the ramp:

Finally, we calculate the maximum height h above the end of the ramp:

The initial vertical speed is given by:

and the final speed is zero, solving for h:

(b) We can observe that the height reached does not depend on the mass of the skier
Explanation:
Remember Newton's Second Law.

If the force acting on both bikers is the same, we can look at the relationship between acceleration and mass.
If Biker 1 has a mass of 10kg and Biker 2 has a mass of 20kg, and both are being acted upon by a force of 100 N, let's see what that looks like. 

So, given the same force, an object with GREATER mass will have less acceleration.
Explanation:
Inertia is the tendency of a body to remain at rest or to do nothing.
It is the resistance to any change in position of body.
When the force on a body increases, the inertia reduces
When the mass is reduced the inertia reduces
According to newton's first law or the law of inertia "an object will remain in its state of rest or of uniform motion unless if it is acted upon by an external force".
Answer:
511.1 J
Explanation:
We are given that
Mass of wood block=m=3 kg
Vertical distance,h=23 m
Horizontal distance =x=30 m
Distance traveled in downward direction y=40 m
Initial velocity,u=0

Where 






By work energy theorem
Change in kinetic energy=Work done= mgh-W



Hence, the work done due to friction on the block as it slides down the ramp=511.1 J
Answer: 3/2 ×KT
Explanation: The average kinetic energy of particles (molecules) in a simple matter is given as
K.E = 3/2 ×KT
where K = boltzman constant and and T = absolute temperature.