Block a (mass = 3 kg), moving at +5 meters per second, collides with stationary block b (mass = 4 kg). block a comes to a sudden stop, while block b starts moving. what will be the approximate final speed of block b?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Can anybody me with this? ? (picture included.)