A motor pulls up a block suspended on a string, so that the tension in the string is equal to the qeight force on the block. the block has mass m, the distance raised is h and the power output of the motor is P. what is the magnitude of the acceleration of the block?

Explanation:

Let T be the tension in the string and mg is the weight of the block.

T = mg

By using Newton's second law

T - mg = ma

mg - mg = ma

a = 0

Thus, the acceleration is zero.

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current flows in a wire