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Kinematics question ( help )?

T

takeurtime

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An electric train accelerates uniformly from the rest to speed 20 m /s which it maintains until the brakes are applied . It's then brought to rest by a uniform retardation equal in magnitude to twice its former acceleration > the total distance coverd is 7800 m and total time taken is 420 s .

sketch a velocity time diagram > calculate
i) the time for which the train is travelling at constant speed
ii) the initial acceleration in m/s

explanation needed please ..thanks in advance :)
 
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