In order to increase the amount of exercise in her daily routine, Tara decides to walk up the seven flights of stairs to her car instead of taking the elevator. Each of the steps she takes are 18.0 cm high, and there are 12 steps per flight. (a)
If Tara has a mass of 61.5 kg, what is the change in the gravitational potential energy of the Tara-Earth system (in J) when she reaches her car?

(b)
If the human body burns 1.5 Calories (6.28 ✕ 103 J) for each ten steps climbed, how much energy (in J) has Tara burned during her climb?

(c)
How does the energy she burned compare to the change in the gravitational potential energy of the system?

Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.

Special care would be an answer