A body starts from rest and picks up a velocity of 15 m/s in 3 s. The acceleration in km/h2 is
Answers
Answer:
HERE IS YOUR ANSWER
Explanation:
initial velocity ( u) = 0m/sec
final. velocity ( v ) = 15 m/sec
time ( t) = 3 sec
acceleration =v- u / t
= 15 - 0/3
= 15 /3
= 5 m/sec ²
= 18 km/ hr
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Answer:
18Km/H²
Explanation:
Acceleration is as we know product of velocity per time.
Given from the question we have, velocity is 15m per sec.
So acceleration is 3 metre per sec.
As a=v/t ,also, v=d/t, so a = d×t/t
In one minute we have 60 secs so in 1 minute, the velocity is 900m/60s
In one hour, we have 60 mins, the velocity is 54,000m/3600s
Given acceleration is 3s, converting in hour it is 3/3600s.
Therefore,
a 3s= 15m/s or
a 3/3600s = 54,000/3600 m/s
a = 54,000/3600 ÷ 3/3600 m/s÷1/s
using cross multiplication, we have
a= 54,000× 3600 ÷ 3600 ×3 m×1/s×s
cutting 3600s or 1H each assume s² to H², we have,
a=54000÷3 m/H²
a= 18,000m/H² or 18thousand(kilo)metres per hour square.
Therefore a=18km/h²