. A graph of position versus time for a certain particle moving along the x-axis is shown in Figure P2.6. Find the instantaneous velocity at the instants (a) t 1.00 s, (b) t 3.00 s, (c) t 4.50 s, and (d) t 7.50 s.

tran (mmt2449) – Homework 02 – yao – (56695) 1 This print-out should have 27 questions. A river has a steady speed of 0.342 m/s . A Multiple-choice questions may continue on student swims upstream a distance of 1.5 km the next column or page – ﬁnd all choices and returns to the starting point. before answering. If the student can swim at a speed of 1.31 m/s in still water, how long does the 001 10.0 points trip take An escalator is 19.8 m long. If a person stands on the escalator, it takes 42.9 s to ride fromCorrect answer: 2457.58 s. the bottom to the top. If a person walks up the moving escalator Explanation: