Luca Congi, of the 2007 Grey Cup Champions Saskatchewan Roughriders, kicks the football with an initial speed of 20 m/s 45.0° above the ground. D. J. Flick, standing on the goal line 60.0 meters away in the direction of the kick, starts running to meet the ball the instant it is kicked.. Neglecting air resistance, what must be his average speed in order to catch the ball just before it hits the ground?

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

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.

im srry but ur wrong the answer is d a smooth rock, some red dirt, and an empty bird's nest.