The law of conservation of energy states that
a) energy may be created, destroyed or transformed.
b) energy may be created, but only in certain types of nuclear reactions.
c) energy may neither be created nor destroyed; it may only be transformed.
d) the energy created by one process must be equal to that destroyed by another process.

the answer is C

energy can neither be created nor destroyed; it may only be transformed

answer is c. energy may neither be created nor destroyed

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards