When describing image formation for plane mirrors, what is an important rule to remember about light rays?
A. The angle when it leaves is the same as the angle when it hits.
B. The angle when it leaves is larger than the angle when it hits.
C. The angle is smaller in the medium that has the higher index of
refraction
OD. The angle is smaller in the medium that has the lower index of
refraction

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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fgravity=10x10=100n case 1

fgravity=30x20=600n case 2

6 times more

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.