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CBSE Class 9 Answered

a train is moving with an initial velocity of 30 metre per second the brakes are applied so as to produce a uniform acceleration of -1.5 metre per second square calculate the timeuniforma uniform acceleration
Asked by binodyadav9181 | 13 Sep, 2020, 07:21: PM
answered-by-expert Expert Answer
v = u + at 
As the brakes are applied, the train will come to rest. 
Thus, final velocity, v = 0
u = 30 m/s 
a  = - 1.5 m/s2 
0 = 20 + (-1.5) x t 
-20 = -1.5 t 
Thus, 
t  =  13.33 s 
Time for uniform aceleration is 13.33 s 
Answered by Shiwani Sawant | 17 Sep, 2020, 10:56: AM

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