Question

a moving train is brought to rest within 20 seconds by applying brakes if the retardation due to breaking is 2 meter per second square then the initial velocity was​
I want steps

Answer 1

Answer:

Explanation:

t= 20s

a =  - 2m/s^2 ( r= 2m/s^2)

v= 0 m/s

v = u + at    (first law of motion)

=> 0 = u + -2 * 20

=>  -u = -40

=> u = 40

so, initial velocity is 40m/s.

Answer 2

Answer: 40 m/s

Explanation: Given :  a moving train is brought to rest within 20 seconds by applying brakes if the retardation due to breaking is 2 meter per second square

To Find : the initial velocity was​

Solution : = 20s

a = -2 m/s2 (r = 2 m/s2)

v= 0 m/s

v = u + at (first law of motion

=> 0 = u + -2 * 20

=> -u = -40

=> u = 40

As a result, the starting velocity is 40m/s.

rapidity; swiftness of motion, activity, or operation A measure of a body's rate of motion represented as the rate of change of its location in a certain direction over time.

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