What's the kinetic energy of the roller coaster at the top and bottom of the hill? Use KE =7mu2 A kiddie roller coaster car has a mass 100 kilograms. At the top
doubles. The car's kinetic energy at the bottom is
of a hill, it's moving at a speed of 3 meters/second. After reaching the bottom of the hill, its speed
v its kinetic energy at the top. The car has
joules of kinetic energy at the bottom of the hill.

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.

snell's law

refractve index = sin incidence / sin refraction