A4 kg bird is flying with a velocity of 4 m/s. what is its kinetic energy?

A10.0 kg cart and a 15kg cart are locked together with a compressed spring between them. they are then released so that the spring pushes the two carts apart. the 10.0 kg cart is moving at 4.5 m/s afterward. how fast is the 15kg cart moving? 3.0 m/s 2.0 m/s 4.5 m/s 5.0 m/s

Anybody wanna ? (picture included? )

What’s #16 asking me and how do i solve it?