3a) Momentum of car is mv but if it stop is 0. Hence the change is mv
b) Area under Ft graph is change in p.Equate the area (trapezium) and p , Fmax can be found.
c) Find the area of the rectangle from 2s to 10s .It is equal to change in p.
d) Since the final p is 0, change in P = momentum at 2s.After finding v, ke can be found . e) the heat produced = initial ke of car
4. After drawing the final velocity diagram , write COM and COKe. DO not omit diagram . Can use velocity of approach = velocity of separation. u1 - u2 = v2 - v1.
The solution include direction . Give magnitude in c) and direction in d) The result of this is predictable as the same mass only exchanges velocity when they collide.
e)In elastic, add the final mass = 2m. Write COM to find final velocity .
