velocity of object just before hitting the ground = 10 m/s
10 m/sExplanation:
here's the solution : -
=》mechanical energy is always constant, when the object is at the top of the building , the object has potential energy but no kinetic energy,
so, at the top of the building the mechanical energy = potential energy = 100 J
but at when it is dropped from the building, the whole potential energy get converted into kinetic energy, just before reaching the bottom .
so, mechanical energy in the object just before hitting the ground = kinetic energy
( potential energy = 0 )
So, kinetic energy = 100 J
now, we know
=》
( since, mass = 2 kg )
=》
=》
=》
so, velocity of object just before hitting the ground = 10 m/s
Answer:
m = 1.64 kg
Explanation:
Given that,
The work done to lift a body, W = 1,033 J
Height, h = 64 m
We need to find its mass. The work done in lifting the mass is given by :
Hence, the mass of the body is 1.64 kg.
Answer:
Explanation:
opposite charges attract
same charges repel
neutral charges don't attract or repel