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The position vector of a particle related to time t is given by m ) k ˆ 7 j ˆ t 15 i ˆ t 10 ( r 2 + + = G The direction of net force experienced by the particle is :

1. Positive x-axis
2. In x-y plane
3. Positive y-axis
4. Positive z-axis

Correct answer: Positive y-axis

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