ꜱᴛᴏɴᴇ ᴅʀᴏᴘᴘᴇᴅ ꜰʀᴏᴍ ʀᴏᴏꜰ ᴏꜰ ʙᴜɪʟᴅɪɴɢ ᴛᴀᴋᴇꜱ 4 ꜱᴇᴄ ᴛᴏ ʀᴇᴀᴄʜ ɢʀᴏᴜɴᴅ . ᴄᴀʟᴄᴜʟᴀᴛᴇ ʜᴇɪɢʜᴛ ᴏꜰ ʙᴜɪʟᴅɪɴɢ !!
ᴋɪɴᴅʟʏ ᴅᴏɴᴛ ꜱᴘᴀᴍ ;)
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ꜱᴛᴏɴᴇ ᴅʀᴏᴘᴘᴇᴅ ꜰʀᴏᴍ ʀᴏᴏꜰ ᴏꜰ ʙᴜɪʟᴅɪɴɢ ᴛᴀᴋᴇꜱ 4 ꜱᴇᴄ ᴛᴏ ʀᴇᴀᴄʜ ɢʀᴏᴜɴᴅ . ᴄᴀʟᴄᴜʟᴀᴛᴇ ʜᴇɪɢʜᴛ ᴏꜰ ʙᴜɪʟᴅɪɴɢ !!
ᴋɪɴᴅʟʏ ᴅᴏɴᴛ ꜱᴘᴀᴍ ;)
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Answer :
The height of the building is 78.4 m
Explanation :
Given :
A stone dropped from the roof of a building takes 4 s to reach the ground
To find :
The height of the building
Solution :
The second equation of motion,
where
S - distance covered
u - initial velocity
t - time taken
a - acceleration
Let "h" m be the height of the building
Here, since the stone is dropped
u = 0 m/s
t = 4 sec
a = g = 9.8 m/s²
S = 'h' m
Substitute the values,
The height of the building is 78.4 m
Verified answer
Answer:
80 m
Explanation:
for falling from height,initial velocity is 0
g = 10m/s^2
use 3rd law of motion