One strategy in a snowball fight is to throw a snowball at a high angle over level ground.
While your opponent is watching this first
snowball, you throw a second snowball at a
low angle and time it to arrive at the same
time as the first.
Assume both snowballs are thrown with
the same initial speed 15 m/s. The first snowball is thrown at an angle of 69◦
above the
horizontal.
A). At what angle should you throw
the second snowball to make it hit the same
point as the first? Note the starting and ending heights are the same. The acceleration of
gravity is 9.8 m/s^2.
B). How many seconds after the first snowball
should you throw the second so that they
arrive on target at the same time?
Answer in units of s.

d is the answer i came up with

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.