1. estimate whether the correlation coefficient between the following variables is positive, negative, or near zero.
a. height of vertical jump and distance of long jump – positive
b. height of vertical jump and time of 40-yard dash – negative
c. height of vertical jump and average speed of 40-yard dash – negative
d. height of vertical jump and free-throw shooting percentage – near zero
e. free-throw shooting percentage and three-point shooting percentage – positive
f. one-repetition maximum in bench press and distance in shot put – positive
g. age beyond 50 years and one-repetition maximum in bench press – negative
h. hours watching television and body mass index – positive
i. age beyond 50 years and total-body muscle mass – negative
j. total-body muscle mass and resting energy expenditure – negative

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.