PE=mgh
180=0.5*10*h
180=5h
h=180/5=36 m
Answer: Pretty sure the answer is B but this kind of looks like a test question.
Explanation:
You didn't give us anything other than the question. No options are provided so I cannot answer. Nobody can.
Answer:
First answer.
Explanation:
There may be a 5N force, but if the frictional force also equals 5N, than they cancel eachother out, resulting in the brick still staying still, as it is resting on a (perfectly) level surface, but any amount of force would make the brick move.
Explanation:
Let the distance covered by the body be s, initial and final velocities be u and v respectively and time taken be t.
By first equation of motion:
Substituting the value of v in equation (1), we find:
Hence proved.
