Answer:
I think they are called balanced forces
Explanation:
It's the energy your body spends to just keep you breathing and your heart beating ... just being alive, without trying to DO anything.
Answer:
a. 
b. 
Explanation:
a)
F= 120,000N
Kinetic energy @ impact = 120,000*depth


b)
The momentum is equal to the impulse on him from the snow so:



Non- mechanical wave does not need matter to carry energy.
e.g:- Light