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At time t = 0 a particle starts travelling from a height z ˆ 7 cm in a plane keeping z coordinate constant. At any instant of time it’s position along the x ˆ and y ˆ directions are defined at 3t and 5t 3 respectively. At t = 1 s acceleration of the particle will be

1. – 30 y ˆ
2. 30 y ˆ
3. 30 x ˆ + 15 y ˆ
4. 3 x ˆ + 15 y ˆ + 7 z ˆ

Correct answer: 30 y ˆ

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