PLEASE HELP WITH THE FOLLOWING 3 QUESTIONS (Show steps thank you:)). 1. when you are 20 years old, you watch Superman (age 40.0) leave Earth on an important mission. He is capable of flying at 2.70 x 10^8 m/s. He finally arrives back at Earth when you are 62.0 years old. How old is Superman?

2. Rick is filming a movie in space and he is travelling so fast that he appears to you on earth to have 9.00 times his normal mass. How fast is he travelling?

3. A human's average life span is 80.0 years. How long in earth years would the average human live if they were travelling around the universe at 0.856c?

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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.

answer(20) psi;