Question

1a)When a 5000-kg roller coaster train full of riders approaches the loading dock at a speed of 20 m/s, it is abruptly decelerated to a speed of 1.5 m/s over a distance of 14 m. Find the retarding force that acts upon the cars

1b)During a physics lab, Jack and Jill ran up a hill. Jack is twice as massive as Jill; yet Jill ascends the same distance in half the time. Who did the most work? Who delivered the most power?

Answer 1

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