Ashell of mass m is fired with speed vo at an angle a up from horizontal. at the top of its arc the ball piece plummeting straight explodes into two pieces of equal down at her at a the ground mass. an observer on sees one speed 2vo and begins to scream and to run due west at 22km/hour. (a) when does the piece mentioned above hit the ground? (b) immediately after the explosion, what is the velocity of the other piece? (c) how much work is done by gravity (d) how far does the woman run before she stops to tweet 'omg'? on the other piece before it hits the ground?

radiation warms things up temp rises convection currents air circ windy weather

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.