A 60 g bullet is fired at 200 m/s into a 400 g block of wood mounted on a spring (k=1200 N/1 m) that is attached to a wall. The surface is frictionless. If the bullet imbeds in the block , how far does the spring compress ? (Hint: use both conservation of energy and momentum )​

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational