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(a) Derive the formula : v = u + at, where the symbols have usual meanings. 

(b) A bus was moving with a speed of 54 km/h. On applying brakes it stopped in 8 seconds. Calculate the acceleration.

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(a) Consider a body having initial velocity ‘u’. Suppose it is subjected to a uniform acceleration ‘a’ so that after time’t’ its final velocity becomes ‘v’. Now, from the definition of acceleration we know that: 

(b) Initial velocity, u=54km/h= 15m/s 

Final velocity, v=0m/s 

Time, t=8s 

Acceleration, a=?

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