A student investigates the amount of energy wasted in four different lamps. She uses the equipment shown in Figure 1. Plan an investigation to find out how much the lamp affects the temperature of the surroundings in 5 minutes. The first step has been given. 1 Set up the apparatus using lamp 1 and take the starting temperature.

The answer is: 6.3mi got it right

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)