An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s. What will be the
velocity after 7 s from the start.
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Answered by
2
Answer:
this is the correct answer.
open these 2 pic and see the answer....
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Answered by
1
Answer:
Explanation:
From s=ut+
2
1
at
2
In first 2 s,
s=20m
20=
2
1
a(2)
2
=2a
a=10 m/s
2
Velocity at the end of 2 s is
v=u+at=0+10×2=20m/s
In next 4s, s=ut+
2
1
a
′
t
2
160=20×4+
2
1
a
′
(4)
2
80=8a
′
a
′
=10 m/s
2
It shows that acceleration is uniform. From v=u+at
v=0+10×7=70 m/s
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