The acceleration of a body is 3m/s2, what does it mean? What is the acceleration of a body moving with a uniform velocity, why? A car moving with the velocity of 15 m/s comes to rest after 5 seconds. Calculate its acceleration.
Answers
The acceleration of a body is 3m/s. This means that the change in the velocity of the body w. r. t is 3m/s.
The acceleration of a body moving with uniform velocity is 0, since there's no change in velocity.
After 5 seconds, the velocity becomes 0. That means from 0 to 5 seconds, the body is in motion w.r.t to time.
Hence v = 0.
u = 15m/s
Now we calculate the acceleration = 0-15/5 = -3m/s
That means that it is negative acceleration or deceleration. The car slows down at t=5 seconds after decelerating with a = -3m/s or d = 3m/s
Just a disclaimer : d in the above equation does not refer to distance, but deceleration or negative acceleration.
Answer:
It means that the velocity increases by 3m/s every second
The acceleration is 0 if it has uniform velocity
u = 15 m/s
v = 0m/s as it comes to rest!
t = 5
formula = a = v-u/t
a = 0-15/5
a = -15/5
a = -3m/s^2
so it is deceleration as the value is negative
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