Answer :

Final answer:

The force needed to lift a 20 kg object is calculated using Newton's second law, which results in a force of 196 N. Thus, the correct choice in your given options is 'a) 196 N'.

Explanation:

The subject of this question is Physics, specifically the concept of force. In physics, the force required to lift an object can be calculated using Newton's second law of motion, which states that the force (F) is equal to the mass (m) of the object multiplied by the acceleration due to gravity (g). So, for a 20 kg body, the force required to lift it would be F = m*g = 20 kg * 9.8 m/s^2 = 196 N. Hence, the correct answer is a) 196 N.

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Final answer:

The correct option is a.

The force required to lift a 20 kg body is 196 N, calculated by using the formula force = mass * gravitational acceleration.

Explanation:

The question is asking for the force required to lift a 20 kg body. To find that, you would use the formula force (F) = mass (m) * gravitational acceleration (g). The gravitational acceleration (g) on Earth is approximately 9.8 m/s². So, if you plug in the given mass of 20 kg into the formula, you get F = 20 kg * 9.8 m/s² which equals to 196 N. Thus, the force required to lift a 20 kg body is 196 N. Note that this assumes no other forces are acting on the body and that we're near the Earth's surface where g can be approximated as 9.8 m/s².

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