A projectile of mass m1 moving with speed v1 in the +x direction strikes a stationary target of mass m2 head-on. The collision is elastic. a) Use the Momentum Principle and the Energy Principle to determine expressions for the final velocities of the projectile and target, making no approximations concerning the masses. b) See what your results to part (a) predict for the limiting cases of m1 >> m2 and m1 << m2. Do these predictions agree with the qualitative analysis?

3is a crest4 is a trough 2 is the amplitude 1 is the wavelength

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Look it up you feel me

Iagree c would be the answer