If the kicker gives the ball the same initial speed and angle but the ball is kicked from a point 25 m from the goalpost, what is the height of the ball above the crossbar as it crosses over the goalpost

answer: b.

explanation:

c) up is the direction the magnetic force is acting on the charge.

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.