QUESTION 2 2.1 Two boys, each of mass m, are standing at the back of a flatbed trolley of mass
4 m. The trolley is at rest on a frictionless horizontal surface.
The boys jump off simultaneously at one end of the trolley with a horizontal
velocity of 2 m-s-1. The trolley moves in the opposite direction
2.1.2 Calculate the final velocity of the trolley. [1m-s ']
​

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )

we need to know the time interval during which the force acts. impulse of force = momentum change

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .