Question

44. A balloon rises with uniform velocity of 10 m/s. When the balloon is at a height of 75 m if a stone is dropped from it. The time taken by it to reach the ground is C) 5 8 D) 7 s B) 48 A) 38​

Answer 1

According to the question:

u=16m/s, v=0m/s, a=g=-10m/s^2

By formula v^2=u^2+2as

0=(16)^2+2(-10)s

0=256-20s

-256=-20s

s=-256/-20

=12.8

Let x be the initial height of the balloon

Using formula t to reach ground when falling freely=√2h/g

√2(x+12.8)/10=4

2x+25.6/10=16

2x+25.6=160

2x=160-25.6

2x=134.4

x=134.4/2

=67.2 metres

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Answer 2

Explanation:

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