Two balls with masses 170 g and 340 g make a head-on elastic collision. Before the collision, the speed of the 170 g ball was 6.1 m/s. After the collision, the total kinetic energy of the system is 9.8 J. What was the initial speed of the other ball?

Box 1 (with mass m = 7.1 kg) is on a frictionless table moving with a velocity Vo = 7.1 m/s. It collides with an identical box (let's call it box 2). The boxes stick together and launch horizontally off the table. What is the kinetic energy of the boxes when they land on the ground a distance H = 1.4 m below the table? H 1 Vo 2 1 d

A 10-g bullet moving horizontally with a speed of 1.8 km/s strikes and passes through a 5.0-kg block initially at rest on a horizontal frictionless surface. The bullet emerges from the block with a speed of 1.0 km/s. What is the kinetic energy of the block immediately after the bullet emerges? 6.4 J 10 J 5.3 J 8.0 J 09.4J

Doing some physics homework and am kind of stumped here!

Mike then takes his now 1175 kg car and crashes it at 50 m/s into the back of a 1600 kg Jeep traveling at 10 m/s.  They roll off together going 18 m/s.  How much work was done by the crumple zone of Mike’s car? Just a short simple answer will suffice.

A 4 kg block moving right at 6 m/s collides elastically with a 2 kg block moving right at 3 m/s. Calculate the final kinetic energy. What is the velocity of a 10 kg object move if an average power of 120 watts is used and the applied force is parallel to the surface? 1.22 m/s 12.2 m/s 0.82 m/s 102 m/s 82 m/s

A 50-g ball is shot into a chamber attached to a 500-g cart.  After the collision the ball/cart combination moves away with a speed of 3.0 m/s.  Assuming that friction and air resistance are negligible, determine the amount of energy lost in the collision.

A 0.015-kg bullet is fired into a stationary block of wood of mass of 5.2 kg. The relative speed of the bullet with respect to the wood is zero after collision (The bullet becomes embedded on the block of wood). If the speed of the bullet before collision is 462 m/s, what is the kinetic energy of the bullet plus-wood combination right after the collision? Assume no change in the potential energy of the system before and after the collision. Express your answer in two decimal places, in Joules.