The brakes of a truck cause it to slow down by applying a retardingforce of 2.60 103 N to the truck over a distance of 780 m. What isthe magnitude of the work done by this force on the truck?
1 J

Is the work positive or negative?
2

Why?

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Nestor RutherfordLv2

30 Oct 2019

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Q#2

(a) You are driving across a gravel bed, when you see apatchof ice ahead, you salm on the brakes attempting to stopbefore youhit the ice. The kinetic energy dissipated in thebraking maneuverwas 3.0 * 10 to powe 5 J . The maneuverbrings your vehicle (assumethe vehicle mass is 1.0 *10 to powe 3kg) to rest at the edge of theice patch. what was your initialvelocity? (b) In attempting to turnyour car arround, you inadvertently end upstuck on the patch of ice( assume it is africtionless surface) and have be pulled off thesurfaceby a tow truck with a cable and winch. The tow truck cableis at anangle of 40.0 degrere with respet to the horizontalsurface. Thetention in the cable during the pulling orocess is 3.50*10to power3 N. The car has a mass of 1.0 *10 to power 3 kg. Howmuch work isdone by the cable in moving the car a distance of 15m?. (c) Thetow truck driver pulls your vehicle onto the flat- bedtow truck bypulling it up onto the bed of the truck. what is thechange in thegravitational potential energy of the car after it isloaded ontothe truck and at a height of 1.8 m above theground?.