A0.02 kg bullet initially traveling at 500 m/s imbeds itself in a 2 kg block. what is the kinetic energy of the block immediately after the collision

Current 1 of 8.4 a runs for 240 seconds and then stops. current 2 is 10.5 a. how long does current 2 have to un to deliver the same amount of charge as current 1? 88.28 192 s 2016 s 21,000 s

See the attachment and solve question 5th

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.