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Q. A 515 kg roller-coaster car rolls down past point A and then up past point B.

a. If the vehicle has a speed of 20.0 m/s at point A, what is the force of the track on the vehicle at this point?

b. What is the maximum speed the vehicle can have at B for gravity to hold it on the track?

Q. Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 15.0 cm) 10.0 cm away from an object. Find the image distance and the magnification. Describe the image that he observes.

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Category:- Physics
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