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CBSE Class 9 Answered

  1. Brake applied to a car produce a uniform retardation of 90m/s .if the car was travelling with a velocity of 27m/s.than what distance will it cover before coming to rest?
Asked by khusbul4c | 24 Jul, 2021, 03:40: PM
Expert Answer
u =27 m/s 
v = 0 ... (brakes are applied final velocity will become zero)
a = - 90 m/s2 (negative sign indicates retardation) 
 
v2 = u2 + 2as 
0 = (27)2 + 2 x (-90) x (s) 
0 = 729 - 180 s 
s = 729/180 =  4.05 m 
 
Answered by Shiwani Sawant | 26 Jul, 2021, 02:18: PM
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