Let `vec(v)` and `vec(a)` denote the velocity and acceleration respectively of a body in one-dimensional motion.

Let v and a denote the velocity and acceleration respectively of a body.

A system of particles is free from any external force vec v and vec a be the velocity and acceleration of the centre of mass, then it necessarily follows that :

Assertion (A) The angle between acceleration and velocity of a body is one-dimensionla motion is always zero. Reason (R ) One -dimensional motion is along a straight line.

Let vec(a) and vec(b) be the position vectors of A and B respectively. If C is the point 3 vec(a)-2vec(b) , then which one of the following is correct?

Let vec( a) _(1) and vec( a) _(2) are the acceleration of wedges A and B. Let vec(b)_(1) and vec(b)_(1) be the accelerations of C and D relative to wedges A and B respectively. Choose the right relation :

Let vec(a) and vec(b) be the position vectors of A and B respectively. If C is the point 3 vec(a) - 2vec(b) , then which one of the following is correct?

Let vec(A) be a unit vector along the axis of rotation of a purely rotating body and vec(B) be a unit vector along the velocity of a particle P of the body away the axis. The value of vec(A).vec(B) is

The linear velocity of a rotating body is given by vec(v)=vec(omega)xxvec(r) , where vec(omega) is the angular velocity and vec(r) is the radius vector. The angular velocity of a body is vec(omega)=hat(i)-2hat(j)+2hat(k) and the radius vector vec(r)=4hat(j)-3hat(k) , then |vec(v)| is-