A man is pushing (a) and pulling (b) a sled with a child at the same angle of 40°. The total weight of the sled with the child exerts a mass of 250kgs. While pushing the man is able to move at a speed of 4m/s2 whereas while pulling he moves at a speed of 5m/s2. Calculate total force which is the sum of force along the x-axis and y-axis for the following images (a) pushing and (b) pulling.

mistakes are ok

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

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.

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