In the movie Fast and Furious 6, Dominic Toreto drove a car from a penthouse on top of a skyscraper and laded on the next one which is 100m away several floors down. If the car landed with an angle 30 degrees to horizontal axis, find a) initial horizontal speed of the car
b) the distance that the car drops down vertically

Two cars collide, lock bumpers and move together after the collision.this collision is known as perfectly inelastic collision.

The anwser is: wave a has a greater pitch and frequency.

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)