Answer:
which two questions you did not post them
At the bottom of the circle, the ball is being pulled upward by tension in the rope and downward by its own weight, so that the net force on it is
∑ F = 450 N - (0.75 kg) g = (0.75 kg) a
where a is centripetal acceleration. At this maximum tension, the ball has a maximum centripetal acceleration of
a = (450 N - (0.75 kg) g) / (0.75 kg) = 590.2 m/s²
Then its maximum tangential speed v is such that
a = v² / (1.0 m)
⇒ v = √((1.0 m) a) ≈ 25 m/s
Answer:
A. 2 hours walking; 12 hours running.
I am aware this is a multiple choice question. There is only one answer.
D. get going
the sentence is in the past
Carl explained to Mark that he had some work to do and had to go.
