an object starting from rest travels 20m in 1st 2 seconds and 160m in next 4 seconds .
what will be velocity after 7 seconds from start?
Answers
Answered by
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Explanation:
Object starts from rest therefore u = 0
It travels 20 m in first 2 secs
We can get our answer.Just by using this condition.
S = ut + 1/2 at^2
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S = displacement
t = time
a = acceleration
u = initial velocity
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S = 1/2 at^2
20 = 1/2 a (4)
a = 10 m/s^2
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For velocity at 7th second..
v = u + at
v = at
v = 10 (7)
v = 70 m/s
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