Aray of light is incident on a plane mirror at an angle of 40 degrees with the mirror surface. what will be the angle of reflection? a) 40 degrees b) 50 degrees c) 90 degrees d) 150 degrees

b) 50 degrees

incident angle = reflected angle BUT grazing angle is given as 40 so incident angle taken from the normal at right angles to the mirror is 50

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.