Answer:
Explanation:
A ball is thrown vertically upward with a certain Kinetic Energy in the absence of air resistance and while returning it experiences air resistance.
Air resistance causes the ball to lose its kinetic energy as it provides resistance which will convert some of its kinetic energy to heat energy.
So in a way total energy is conserved but not kinetic energy as some portion of it is lost in the form of heat.
1. 6.0 m
force/mass× acceleration is the equation
since the accelaration is unknown you would divide 180 by the mass of 30kg which is 6
2.A
Answer: This will be based on how much strength she put into the rock when throwing it
Explanation:
264 km
72 x 3 hr = 216 km
72/60 (min in an hr) = 1.2(km per min) x 40 = 48 km
216 + 48 = 264
