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The Brainliest Answer!
2015-05-29T00:21:56+05:30
Initial velocity(u) = 72kmph = 20m/s towards east
final velocity(v) = 90kmph = 25m/s towards west
since velocity is a vector quantity, change in direction plays an important role
.`. v = 25m/s due west and u= -(20m/s) due west
[`.` change in direction changes the sign]
change in velocity = v - u
= 25 - [-(20)]
= 25 + 20
= 45m/s due west
.`. answer is option (d).....
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