**Question **:

A Particle moves along a straight line such that its position x at any instant t is x = 6t^{2} – t^{3}. Where x in meter and t is in second. then ,

(a) At t=0 acceleration is 12 m/s^{2}

(b) x-t curve has maximum at t = 4s

(c) Both (a) and (b) are wrong

(d) Both (a) and (b) are right

**Answer**: The right option is (d)

**Solution **: