A student uses a wheelchair to get around campus, which she travels to on a public bus. She boards the bus using a motorized lift attached near the bus door. The electric lift motor uses 1.4 kilojoules of energy to raise the student and wheelchair from the sidewalk to the level of the bus interior, a total displacement of 0.75 meters. If the mass of the
wheelchair is 20 kilograms and the mass of the student and her belonqings is 60 kilograms, what is the efficiency of
the motor? (Estimate g as 10 m/s2.)

a) 2.3%
b) 11%
c) 32%
d) 43%

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.

Idon't  know if i got it wrong but i picked ( a )