Aboy can raise a rock that weighs 95n by using a lever and applying force of 15n what is the mechanical advantage of the lever

The mechanical advantage is 6.33

Explanation:  Mechanical advantage is calculated as:

Ma = Fb/Fa where Fb is the force that the machine does, and Fa is the force that you do to the machine.

The minimal force needed to lift an object is equal to its weight, so here the force that does the machine, Fb, is equal to 95N.

And we know that the force that the boy does is equal to Fa = 15N, so using the equation for the mechanical advantage we have:

Ma = Fb/Fa = 95N/15N = 6.33

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.