Neglecting air resistance, the horizontal velocity of a projectile

It is always constant, it does not change from beginning to end. Also, it is independent from the vertical velocity.

Thus, Vxi = Vxf

So if the horizontal velocity is to 2m/s at the beginning, then it will keep going at 2m/s until it reaches the ground.

c) up

hope this

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.