The conveyor belt moves horizontally at a speed of u. On the tape at a tangent to it flies a body whose speed is perpendicular to the direction of movement of the tape and at the time of hitting the body on it is equal to v. The body slides along the tape and then stops. Find the work of the friction force applied to the body from the side of the tape and to the tape from the side of the body. Why is the performance different in these cases?