The position of an object moving along x-axis is given by x=a+bt^(2) where a=8.5m, b=2.5ms^(-2) and t is measured in seconds. Then which of the following is true?

The position of an object moving along x-axis is given by x=a+bt^(2) w

1.	The position of an object moving along x-axis is given by x=a+bt^(2) where a=8.5m, b=2.5ms^(-2) and t is measured in seconds. Then which of the following is true?
Answer» VELOCITY at `t=2` SEC is zero average velocity between `t=2, t=4` sec is `15m//s` velocity at `t=4` sec is `10m//s` all the above are true Answer :B