Question

19. A balloon starting from ground has moving up with uniform
velocity for 3 sec and a stone is dropped from it reaches the
ground in 6 sec. The velocity of the balloon is
(1) 10 m/s
(2) 15 m/s
(3) 20 m/s
(4) 5 m/s
​

Answer 1

Answer:

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Explanation:

s=ut+

2

1

at

2

−60=5(t)+

2

1

(−10)t

2

−60=5t−5t

2

5t

2

−5t−60=0

t

2

−t−12=0

t

2

−4t+3t−12=0

(t−4)(t+3)=0

∴t=4

Height of balloon from ground at this instant

=60+4×5=80 m