Physics, asked by prashamsaadhikari, 9 months ago

93. A body starts from rest and falls vertically through
a height of 19.6 m. If g =9.8 m/s2, then the time
taken by the body to fall through the last metre
of its fall is :
(a) 0.45 s
(b) 1.95 S
(c) 0.05 S
(d) 2.00 s​

Answers

Answered by hemendrorabha0012
1

Explanation:

As the body rises from the height of 19.6m

since heighr=19.6m

Initial velocity(u)=?

Final velocity(v)=0

Acceleration(g)= -9.8m/s

Time=0

Applying

v^2-u^2=2gh

(0)^2-(u) ^2=2x(-9.8)x19.6

0-u^2= -19.6x19.6

-u^2= -384.16

-u=√384.16

-u =19.6

Applying

v=u+gt

0= 19.69.8xt

= 19.6=9.8xt

19.6/9.8=t

=2.00s

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