Astationary receiver detects a change in frequency of the signal from a jet flying directly away from it at 300 m/s. which of the following receivers will detect the same change in frequency from a jet moving away at 600 m/s? a) a receiver moving at 900 m/s in the opposite direction as the jetb) a receiver moving at 300 m/s in the opposite direction as the jetc) a stationary receiverd) a receiver moving at 300 m/s in the same direction as the jet

Special care would be an answer

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)