Answer:
-0.5 m/s
Explanation:
given:
u (initial velocity) = 10 m/s
v (Final velocity) = 0 m/s (because it is given that it comes to a complete stop)
t (time taken) = 20 s
therefore,
acceleration = v - u / t
a = 0 - 10 / 20
a = -10 / 20
a = -1/2
a = -0.5
There is a acceleration of -0.5 m/s
Answer:
Option A
Air resistance
Explanation:
Despite the law of conservation of energy stating that energy can neither be created nor destroyed but can only be transformed from one state to the other, the process of transformation is not 100% efficient since some energy losses occur due to friction and air resistance. Therefore, when the final energy is slightly less than the original dor this case, it's due to energy loss due to air resistance.
The first and third choices could both do it, but the first choice makes a much better, clear demonstration.
I think that peeing might be the correct answer? xD
From first law of motion, law of inertia, we know that an object remains in the state of rest or motion unless acted upon by an unbalanced external force. The skateboard riding down a hill when reaches the bottom slows down due to <u>frictional force </u>acting in the opposite direction. Frictional force is a contact force which acts between two surfaces against the direction of motion of one surface over the other. Here, frictional force acts <u>between skateboard and ground</u>. This reduces the speed of the skateboard and it eventually stops.
