Advertisements
Advertisements
Question
A light mass and a heavy mass have equal momentum. Which will have more kinetic energy?
(Hint : Kinetic energy K = P2/2m where P is the momentum.)
Solution
We know that momentum p = mass × velocity
Let m1, m2 be the mass of two bodies having velocity v1, v2
∴ Their momentum is m1 v1 and m2 v2
Since m1 v1 = m2 v2 (given),
If m1 < m2, v1 > v2
∴ Kinetic Energy of lighter mass is greater.
Since K.E = `1/2 mv^2`
APPEARS IN
RELATED QUESTIONS
Name the process used for producing electricity using nuclear energy.
A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is at the ground.
Name the form of mechanical energy, which is put to use.
Name the energy changes for the following
human body
State the energy changes which take place when:
A stone projected vertically upwards, returns back to the thrower.
Give one example when:
Sound energy changes to electric energy.
Give one example when:
Electrical energy to heat energy.
What is the form of that graph between
(i) K.E. and velocity for a constant mass?
(ii) K.E. and mass for a constant velocity?
In which states is water found in nature?
