Faina says that an object cannot be in mechanical equilibrium when only a single force acts on it. do you agree or disagree? explain.

A single force can't bring mechanical equilibrium. As the third law of Newton which very fresh and deliberately worded: To each action, there is dependably an equivalent and inverse response. The third law implies by action, the force. So the forces exist in pairs. Besides, by equilibrium, we mean either the body is rest or in uniform movement (both transnational or rotational) because of no external force or net external force is zero by the first law of motion. Thus no mechanical equilibrium condition is acquired by one single force.

Hence, I agree with Faina statement.

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.