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The Brainliest Answer!
initial velocity = 20 m/s
acceleration = -5 m/s² 
final velocity = 0 m/s
v = u + at
0 = 20 + (-5t)
-20 = -5t
4 = t
therefore time taken by the object to come into rest = 4 sec

i hope it helps....... 
2 5 2
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