Answer:
d
Explanation:
you have to divide by the square root and then use the factorial to multiply
The sun, fire and lamp because they generate their own light.
Answer:
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If the object is following a curve, or turning a corner, or slowing down, or speeding up, then it's motion is accelerated.
Answer:Hollow sphere
Explanation:
Given
same mass for solid and hollow sphere
same
before they start up incline
Moment of inertia of solid Sphere

Moment of inertia of hollow sphere

Conserving Energy at bottom and top point for solid sphere
kinetic energy +Rotational Energy=Potential energy

for pure rolling 



For hollow sphere


therefore height gained by hollow sphere is more