Answer:
Explanation:
According to the work-energy theorem, the work done on the car is equal to its variation of kinetic energy:
where
m = 1900 kg is the mass of the car
vf = 15 m/s is the final speed
vi = 25 m/s is the initial speed
Substituting the data, we find
and the work is negative because it is done against the motion of the car (in fact, the car slows down, so it loses kinetic energy).
Answer:
because otherwise the harmful Ultraviolet rays of the sun penetrates the Earth's surface and causes numerous diseases in humans like skin cancer, cataract etc.
Which element is magnetic?
Answer
cobalt
Answer:
Explanation:
The total momentum of the system must conserve by the law of momentum conservation.
( 1 )
If you consider the shock between the ball and the truck as totally elastic, and also if the truck is much more massive than the ball, you can assume that the truck does not move when the ball hits it.
Then the truck is always at rest
Hence, you have in the expression ( 1 ):
Answer:
The weight of an object would be less on the moon than on the earth
Explanation:
Thus, our object has mass m both on the surface of the Earth and on the surface of the Moon, but it will weigh much less on the surface of the Moon because the gravitational acceleration there is a factor of 6 less than at the surface of the Earth.