Final answer:
Sara's weight is 588 Newtons and the work she does throughout the journey is 10584 Joules. Without additional circumstances, her acceleration is normally seen as 0. Without a given time frame, her speed is incalculable.
Step-by-step explanation:
To answer the questions we need to take into account fundamental physics principles such as gravitational force, work, acceleration, and velocity.
a) Sara's weight can be calculated using the formula W = m * g, where m is mass and g is gravitational acceleration (approximately 9.8 m/s² on Earth). Thus, her weight is 60 kg * 9.8 m/s² = 588 N.
b) The work done by Sara is calculated by using the formula W = F * d, where F is force and d is distance. As she uses the same force to counteract her weight, her work done would be 588 N * 18 m = 10584 J.
c) The acceleration of Sara isn't given in the question, and without knowing additional forces acting on her, it would usually be considered as zero in an ideal situation where the only force is gravity which she is counteracting.
d) Without a time frame given for the trip, we cannot calculate Sara's speed.
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