Question

from top of a building 125 m high a ball is thrown horizontally with speed 10 m/s. The time taken by it to reach the ground is.(take g=10 m/s² )

Answer 1

Answer:

ғɪʀsᴛ , ᴡᴇ ʜᴀᴠᴇ ᴛᴏ ғɪɴᴀʟ ғɪɴᴀʟ ᴠᴇʟᴏᴄɪᴛʏ :

ᴜsɪɴɢ ᴛʜᴇ ᴛʜɪʀᴅ ᴇǫᴜᴀᴛɪᴏɴ ᴏғ ᴛʜᴇ ᴍᴏᴛɪᴏɴ -

ᴠ^2 = ᴜ^2 + 2ɢʜ

ᴠ^2 = 0^2 + 2 * 10 * 125

ᴠ^2 = 2500

ᴠ = 50ᴍ/s

ᴛʜᴇɴ , ᴡᴇ ʜᴀᴠᴇ ᴛᴏ ғɪɴᴅ ᴛɪᴍᴇ :

ᴜsɪɴɢ ᴛʜᴇ ғɪʀsᴛ ᴇǫᴜᴀᴛɪᴏɴ - ᴠ = ᴜ + ᴀᴛ

ᴛ = ᴠ - ᴜ / ɢ

ᴛ = 50 - 0 / 10

ᴛ = 5s