A10 newton effort force is required to lift a 10 kg box just off the ground. what is the effort required to lift the box off the ground using a 3m long lever? [the fulcrum is placed 0.5m from the box.]

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?