Assuming there is not loss of energy due to frinction (which is an idealization), you can use the conservation of energy law in the form:
Mechanical energy at top = mechanical energy at bottom.
Mechanical energy at top = potential energy = m * g * h
Mechanical energy at bottom = kinetic energy = m * v^2 / 2
=> m *v^2 / 2 = m * g * h
=> v^2 / 2 = g * h
=> v ^2 = 2gh
=> v = √(2gh) = √(2 * 9.8 m/s^2 *30m) = 24.25 m/s
Answer: 24.25 m/s
Is a carbohydrate that is made from carbon, hydrogen and oxygen
Answer: Formation of the Earth's iron core.
Explanation: The stratification of Earth into its geologic layers was brought about by the formation of the Earth's iron core. The iron core was generated by a combination of radioactive decay and gravitation, which raised the temperature enough for molten iron to form.
B. The blue car has more kinetic energy than the red car
Using p1v1/t1=p2v2/t2
p1=50
p2=225
v1=400ml
v2=?
t1=-20=253k
t2=60=333k
50x400/253=225xv2/333
7.9=0.7xv2
v2=7.9/0.7
v2=11.3ml
