Question

20. Name the three components of biosphere. Which event before the appearance of life started the evolution of these spheres? What is the proof of this event?

Answer 1

the time taken to move upward=time taken to move downwad

so the time taken by the stone to come down from the highest point=2 s

so from 2 nd equation of motuion,as it was moving down: 0+1/2 gt2=h

h=5x2x2=20 m

so ut-1/2 g t2=20 while moving up

2u-20=20

u=20m/s

ie the distance it covered in t=1 sec from the highest point:h=5t2=5m