The position-time relation of a particle moving along the x-axis is given by
`x=a-bt+ct^(2)`
where a, b and c are positive numbers. The velocity-time graph of the particle is

Options

A.
B.
C.
D.

Answer

C

Explanation

` u =dx//dt = -b+ 2ct . ` This is a straight line with positive slope and negative u-intercept.