- Lola applies force to the handle of a jack so that she can change the flat tire on her car. If she uses 1,250 joules of energy on a jack that is 40 percent efficient, how much energy is available to raise
the car?

750 energy

Explanation:

750 energy jack percent efficient

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

helium

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