Answer:
Explanation: Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system. The device preserves the input power and simply trades off forces against movement to obtain a desired amplification in the output force.
Answer:

Explanation:
Momentum is the product of velocity and mass. The formula is:

We know the rock is falling. Its momentum is 200 kilograms meters per second and its velocity is 5 meters per second. Substitute the values into the formula.

We are solving for m, the mass. We must isolate the variable. It is being multiplied by 5 meters per second. The inverse of multiplication is division, so we divided both sides by 5.0 m/s.


The units of meters per second (m/s) cancel.


The falling rock has a mass of <u>40 kilograms.</u>
Mass/volume is the formulae
X- points away from the charge
y- points in the direction of the force on the positive charge
z- points toward the charge