8
A ball is dropped from a balloon going up at a speed of 10 ms. If the balloon was at height 40m at
time of dropping the ball, How long will the ball take in reaching the ground.
a) 4 s
b) 6 s
c) 2 s
d) 5 s
Answers
Answered by
1
5 S
Explanation:
because the the ball is at the speed of 10ms
Answered by
0
Answer:
Displacement will be
60
m
Explanation:
When the ball will be dropped,it will have an initial velocity of
7
m
s
upwards,
Now,let it will take time
t
to reach the ground,
so using
s
=
u
t
+
1
2
g
t
2
Here,
s
=
60
m
(as after going up,it will come down by that distance and will go down by the total displacement of
60
m
) and
,
u
=
−
7
m
s
(taking upward direction to be positive)
So,our equation becomes,
60
=
−
7
t
+
1
2
⋅
10
t
2
Solving,we get,
t
=
4.24
s
ALTERNATIVELY
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