Author Question: A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block ... (Read 200 times)

bobbysung · **on:** Jul 28, 2018

A 10-g bullet moving horizontally with a speed of 2.0 km/s strikes and passes through a 4.0-kg block moving with a speed of 4.2 m/s in the opposite direction on a horizontal frictionless surface. If the block is brought to rest by the collision, what is the kinetic energy of the bullet as it emerges from the block?
a. 0.51 kJ
b. 0.29 kJ
c. 0.80 kJ
d. 0.13 kJ
e. 20 kJ

Question 2

A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
a. 22 J
b. 24 J
c. 26 J
d. 20 J
e. 28 J