Question

1 A ball thrown up vertically returns to the tower after 6
Pind
a) the velocity with which was town op.
to the maximum height reaches and
let position after 4 s.​

Answer 1

ᴛʜᴇ ʙᴀʟʟ ʀᴇᴛᴜʀɴs ᴛᴏ ᴛʜᴇ ɢʀᴏᴜɴᴅ ᴀғᴛᴇʀ $6$ sᴇᴄᴏɴᴅs.

ᴛʜᴜs ᴛʜᴇ ᴛɪᴍᴇ ᴛᴀᴋᴇɴ ʙʏ ᴛʜᴇ ʙᴀʟʟ ᴛᴏ ʀᴇᴀᴄʜ ᴛᴏ ᴛʜᴇ ᴍᴀxɪᴍᴜᴍ ʜᴇɪɢʜᴛ (h) ɪs $3$ sᴇᴄᴏɴᴅs i.e t =$3$ s

ʟᴇᴛ ᴛʜᴇ ᴠᴇʟᴏᴄɪᴛʏ ᴡɪᴛʜ ᴡʜɪᴄʜ ɪᴛ ɪs ᴛʜʀᴏᴡɴ ᴜᴘ ʙᴇ u

ғᴏʀ ᴜᴘᴡᴀʀᴅ ᴍᴏᴛɪᴏɴ,

$v=u+at$

$∴\:0 = u + ( - 10) \times 3$

$u=30 m/s$