Two balls have masses 66 kg and 31 kg. The 66 kg ball has an initial velocity of 24 m/s (to the right) along a line joining the two balls and the 31 kg ball is at rest. The 31 kg ball has in initial velocity of 16 m/s. The two balls make a head-on elastic collision with each other. What is the final velocity of the 66 kg ball? Answer in units of m/s.

b. What is the final velocity of the 31 kg ball? Answer in units of m/s

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

What part of the ear is names after tools, such as the hammer and the anvil?