Observer a, who is at rest in the laboratory, is studying a particle that is moving through the laboratory at a speed of v-0.8c and determines its lifetime to be ta 107 ns. observer a places markers in the laboratory at the locations where the particle is produced and where it decays. how far apart are those markers in the laboratory? 25.68m (b) observer b, who is traveling along with the particle, observes the particle to be at rest and measures its lifetime to be tb 136 ns. according to b, how far apart are the two markers in the laboratory? 54.36x m

answer: b.

explanation:

more than, less

less than, more

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.