Two 10 kg pucks head straight towards each other with velocities of 10 m/s and -20 m/s. they collide and stick together. calculate the resulting velocity.

Excuse ! extra points plus ! super desperate ! the position of an object does not move relative to a reference point. relative to the reference point the object _. a.) is not moving. b.) is moving.

Ineed the answers for these promblems i have

Photons with the highest energy have the longest period