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A body is dropped from the …

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A body is dropped from the roof of a building 10 m high . Calculate the time of fall and the speed with which it hits the ground . Take g=10m per sec2

Posted by Md Sahid 4 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 4 years, 3 months ago

given: s= 10m
g= 10m/s²
u will be take 0 because initailly the body will on rest
s= ut+1/2 at² a= g because of vertical

10= 0(t)+1/2(10) × t²
10= 5t²
2=t²
t= √2
t= 1.41

v= u+at
v= 0+gt
v= 10 × 1.41
v=14.1
v = 14m/s app

0Thank You

Gaurav Seth 4 years, 3 months ago

S=10m
g=10m/s
u=0m/s [ Body Starts From Rest ]
v = ?

v^2 - u^2 = 2gs
v^2 - 0^2 = 2 x 10 x 10
v^2 = 200
v = Root Of 200 (√200)
v = 14.14 ( Approx. )
Speed = 14.14 m/s

v=u+gt
14.14=0+10 x t
14.14=10t
t=14.14/10
t= 1.414 seconds
Time = 1.414 seconds

0Thank You

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