Two intersecting straight lines move parallel to themselves with speeds `3m//s` and `4m//s`, respectively. The speed of the point of intersection of the lines, if the angle between them is `90^(@)` will be

Find the number of point of intersection of two straight lines .

Two lines that intersect in such a way that the angle between them is 90^@ are called _______ lines.

Two masses nm and m , start simultaneously from the intersection of two straight lines with velocities v and nv respectively. It is observed that the path of their centre of mass is a straight line bisecting the angle between the given straight lines. Find the magnitude of the velocity of centre of mass. [Here theta= angle between the lines]

Two particle of mass 2 kg and 1 kg are moving along the same straight line with speeds 2m//s and 5m//s respectively. What is the speed of the centre of mass of the system if both the particles are moving (a) in same direction (b) in opposite direction ?

A particle moving in a straight line covers first half of the distance into two equal time intervals with speed of 2 m/s and 4 m/s respectively, and second half with the speed of 5 m/s. The average speed of the particle is

A particle moving in a straight line covers first half of the distance into two equal time intervals with speed of 2 m/s and 4 m/s respectively, and second half with the speed of 5 m/s. The average speed of the particle is