6) A car of mass 1200 kg accelerates from rest to a speed of 8.0 m s-1 in a time of 2.0 s
a) Calculate the forward driving force acting on the car while it is accelerating
Assume that, at low speeds, all frictional forces are negligible,
[3]
b) At high speeds the resistive frictional force F produced by air on a body moving
with velocity v is given by the equation F=bvº, where b is a constant.
1 Derive the base units of force in the Sl system
(2)
il Determine the base units of b in the SI system
[2]
ili The car continues with the same forward driving force and accelerates until it
reaches a top speed of 50 m 5-1. At this speed the resistive force is given by the
equation F by 2. Determine the value of b for the car.
(4)
iv Sketch a graph showing how the value of F varies with v over the range 0 to 50 m
3-1. Use your graph to describe what happens to the acceleration of the car during
this time
[4)

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

hope this ! this is not copied! search it up, it's free of plagiarism!

the maxium height is 34m/s

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.