Question

A helicopter is ascending vertically with a speed of 8.0ms^(-1) .At a height of 120m above the earth, a package is dropped from a window. How much time does it take for the package to reach the ground? 1) 1.23s
2) 3.23s
3) 5.83s
4) 7.83s ​

Answer 1

Answer:

R.E.F. Image.

U = 8 cm/sec.,a = -g

s =ut+

2

1

at

2

−12=8t−

2

1

×9t

2

−12=8t−5t

2

5t

2

−8t−12=0

t = 2.53 seconds.

so, option (d)

Answer 2

Answer:

ᴜ = 8 ᴄᴍ/sᴇᴄ.,ᴀ = -ɢ

s =ᴜᴛ+21ᴀᴛ2

−12=8ᴛ−21×9ᴛ2

−12=8ᴛ−5ᴛ2

5ᴛ2−8ᴛ−12=0

ᴛ = 2.53 sᴇᴄᴏɴᴅs.

sᴏ, ᴏᴘᴛɪᴏɴ (ᴅ)

Explanation:

ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ʏᴏᴜ ❣️ ғᴏʟʟᴏᴡ ᴍᴇ