velocity and acceleration of a particle at some instant are
`v=(3 hati-4 hatj+2 hatk) m//s and a=(2 hati+hatj-2hatk) m//s^2`
(a) What is the value of dot product of v and a at the given instant?
(b) What is the angle between v and a, acute, obtuse or `90^@`?
(c) At the given instant, whether speed of the particle is increasing, decreasing or constant?

Answer

A, B, C, D