Advertisements
Advertisements
प्रश्न
When the speed of a moving object is doubled, then its kenetic energy ______.
विकल्प
remains the same
decreases
is doubled
becomes four times
Advertisements
उत्तर
When the speed of a moving object is doubled, then its kenetic energy becomes four times.
Explanation:
Kinetic energy (k) ∝ (velocity v)2
Now `("k'")/"k"=(2"v")^2/("v")^2`
⇒ k' = 4k
APPEARS IN
संबंधित प्रश्न
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
The energy of a flying kite is kinetic energy.
State two factors on which the kinetic energy of a moving body depends.
When an arrow is shot from a bow, it has kinetic energy in it. Explain briefly from where does it get its kinetic energy?
A body of mass 60 kg has the momentum 3000 kg m s-1. Calculate:
- the kinetic energy.
- the speed of the body.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
When a ball is thrown inside a moving bus, does its kinetic energy depend on the speed of the bus? Explain.
Find out the form of energy possessed by the following thing.
Water falls
A body starts from rest and is acted on by a constant force. The ratio of kinetic energy gained by it in the first five seconds to that gained in the next five-second is:
