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CBSE Class 9 Answered

A car increases it’s speed from 36km/h to 54km/h in 2s Find Distance travelled by the car

Asked by grangerhermione951 | 02 Dec, 2021, 08:32: AM
Expert Answer
Initial speed  u = 36 km/hr = 36 × ( 5 / 18 ) = 10 m/s
 
Final speed  v = 54 km/hr = 54 × ( 5 / 18 ) = 15 m/s
 
acceleration a = ( v - u ) / t  =  ( 15 - 10 ) / 2 = 2.5 m/s2
 
 
Distance S travelled is determined from  " S = u t + (1/2) a t2  "
 
S = ( 10 × 2 ) + (1/2) × 2.5 × 4  = 25 m
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