A green 6 kg ball is moving at 4 m/s. It collides with an orange 4 kg ball that is not moving (v= 0m/s). After the collision the green ball stops moving (v=0 m/s). What is the velocity of the orange ball after the collision? Select One:

A: 6 m/s
B: 4 m/s
C: 0 m/s
D: 8 m/s ​

Keneila is attempting to ski down a 20 m high friction free hill for the first time. she has a speed 10 m/s at the top. what is her kinetic energy when she is a the bottom, 20 m ? (a)2500 j (b)9800 j (c)12300 j (d)3100j (e)15000j

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

In science and physics what is the standard unit of measure for speed?