Arock dropped on the moon will increase its speed from 0 m/s (its starting speed) to 8.15 m/s in about 5 seconds. if you were standing on the moon, measuring the rock's motion, what would you measure for the magnitude of its acceleration? o a. 8.2 m/s2 o b. 41 m/s2 o c. 9.8 m/s2 o d. 1.63 m/s2

The answer is:

The correct option is the option D

To calculate the acceleration, we need to use the following formula that involves the given information (initial speed, final speed, and time).

We need to use the following free fall equation:

Where:

is the final speed.

is the initial speed.

g is the acceleration due to gravity.

t is the time.

We are given the following information:

Then, using the formula to isolate the acceleration, we have:

Now, substituting we have:

Therefore, since we are looking for a magnitude, we have that the obtained value will be positive, so:

Hence, the correct option is the option D

Have a nice day!

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.