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A horizontal rope is tied to a 90kg box on frictionless ice. A) What is the...

A horizontal rope is tied to a 90kg box on frictionless ice. A) What is the tension in the rope if the box moves at a steady 9.0m/s ? B) What is the tension if the box has Vx=9.0m/s & Ax=5.0m/s^2?

For a wouldn't the equation be T=ma which would be T=90*9.0=810? This seems to be incorrect though.

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