A particle moves according to the law of motion where t is measured in seconds and...

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A particle moves according to the law of motion where t is measured in seconds and s in feet. a.) Find the velocity at time t. Answer: b.) What is the velocity after Answer: U seconds? s = t 6t + 3t, t 0, c.) When is the particle at rest? Enter your answer as a comma separated list. Enter None if the particle is never at rest. Answer: d.) When is the particle moving in the positive direction? When 0 A particle moves according to the law of motion where t is measured in seconds and s in feet. a.) Find the velocity at time t. Answer: b.) What is the velocity after Answer: U seconds? s = t 6t + 3t, t 0, c.) When is the particle at rest? Enter your answer as a comma separated list. Enter None if the particle is never at rest. Answer: d.) When is the particle moving in the positive direction? When 0