IV. The parabolic path of a projectile can be described by quadratic equation y=Ax2+Bx+C, what is the unit of A?

    A.    m
    B.    m-1
    C.    m2
    D.    m-2
    E.    No unit

Ans. B

V.

An external horizontal force of 200N is applied to a block at rest on the table top as shown in the figure. The coefficient of static (ms) and kinetic (mk) friction between the block and the table top are given as 0.46 and 0.42 respectively. What is the frictional force acting on the block?

    A.    450.8N
    B.    411.6N
    C.    200N
    D.    92N
    E.    84N

Ans. C