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The velocity of a car at any time t is g...

The velocity of a car at any time t is given by the equation `v_(x) = 60 ms^(-1)+ (0.5 ms^(-3) )t^(2)` . The change in the velocity of car in the time interval between `t_(1) = 1.0s` and `t_(2), = 3.0`s is :

A

`4 ms^(-1)`

B

`6 ms^(-1)`

C

`3 ms^(-1)`

D

`5 ms^(-1)`

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