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
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vickyjazz:
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Answered by
27
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.
Answered by
1
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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