Identify the phases in the life cycle of small and big stars. supernova: in this stage, the star collapses and produces elements heavier than iron. planetary nebula: in this stage, the star emits strong energy pulses that push away the outer layers creating a cloud of ionized gas around the core. neutron star: in this stage, the star has reduced to an extremely dense core. white dwarf: in this stage, the star has reduced to a dense core.

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.

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.