Please help me
What is the ratio between the acceleration due to gravity of two hypothetical planets X and Y, if the mass of the

planet X is three times greater than the mass of the planet Y, and the radius of the planet X is twice greater of

the radius of the planet Y.

answer: b.

explanation:

c. newton's third law of motion

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.