A quantity that has only one magnitude

What is the kinetic energy of a 10-kg bicycle moving at 10 m/s

Which is an example of gaining a static charge by conduction? a) rubbing a balloon against your hair. b) shuffling your shoes across a carpet. c) bringing a charged rod near an electroscope. d) touching your car on a cold day and getting a shock.

What do you think car designers do if the damage caused by a crash test is too severe?