I think it is b , that what I would i pick
Answer:
Heat flows from higher to lower temperature. So when you keep hot things in normal temperature, the heat from hot object transfers to the environment until they are both on the same level. Same happens when a cold object is kept in normal room temperature, the heat from the environment transfers to the cold object until they are both equal. its all about achieving the equilibrium in a system
Answer:
Explanation:
Given
height from which ball is dropped 
and it rises to a height of 
A person caught the ball in mid-way i.e. at a height of
from pavement
time taken to reach the bottom is given by

where y=displacement
u=initial velocity
a=acceleration
t=time
here initial velocity is zero i.e.


Similarly to reach of height
time taken is 

The ball is caught in mid-way i.e. ball travel a distance of 
time taken is 
total time taken 



total time =3.429 s