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1. if an object has a mass of 20 kg,what is the force of gravity

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1. if an object has a mass of 20 kg,what is the force of gravity acting on it on earth ? A. 196 n B. 2.04 kg C. 32.67n D. 1.96kg 2. a machine is supplied energy at a rate of 4,000w and does useful work at a rate of 3,760 w. what is the efficiency of the machine ? A. 92 percent B.94 percent C. 96 percent D.97 percent

1. if an object has a mass of 20 kg,what is the force of gravity acting on it on earth ? A. 196 n B. 2.04 kg C. 32.67n D. 1.96 kg

2. a machine is supplied energy at a rate of 4,000w and does useful work at a rate of 3,760 w. what is the efficiency of the machine ? A. 92 percent B. 94 percent C. 96 percent D. 97 percent