Question

Define Acceleration? Is it a vector quantrty? A moving train is brought to rost with in 30 seconds by applying brakes. what is its initial velocity if retardation is 3 m/see2 ​

Answer 1

Answer:

Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.

Acceleration is a vector quantity.

Explanation:

Given:

Final velocity, v = 0 m/s² [comes to rest]

Time taken, t = 30 sec

Acceleration, a = 3 m/s²

To find:

Initial velocity = u

Solution:

From the equation, v = u + at, we have

u = v - at

u = 0 - 3 × 30

= -3 × 30

= -90 m/s²

I guess this is the right answer.. I'm sorry if I'm wrong.

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