Question

15. (a) How long will a stone take to fall to the ground
from the top of a building 80 m high and (b) what
will be the velocity of the stone on reaching the
ground ? (Take g = 10 m )
Ans.(a) 4 s. (b) 40 ms​

Answer 1

Answer:

           t = 4s

          v = 40m/s

Step-by-step explanation:

freefall from rest

s = 80m  ,  u = 0  ,  g  =  10m/s²

s = ut + gt² / 2

s = gt² / 2

t² = 2s / g

t² = 2 × 80 / 10

t² = 2 × 8

t² = 16

t = 4s

2as = v² - u²

2as = v²

v² = 2 × 10 × 80

v² = 1600

v = 40m/s

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