Question

A bullet of mass 20g travelling at speed of 350m per second strike a steel plate at an angle of 30degree with the plane of plate it ricochets off at the same angle at a speed of 320m per second what is the magnitude of impulse that the steel plates gives to the projectile if the collision with with the plates take places over a time dt=10ki power -3s.what is average force exerted by the plateson the bullet