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Question:

500 Watt crane lifts bucket of rock 12 meters in 3 secs and constantspeed.What is the mass of the bucket&rock?

i dont understand how to get acceleration.

Answer:

Wow, some great ideas here is one of mine ) Grilled Salmon with Key Lime Butter 5 tablespoons unsalted butter 2 tablespoons key lime juice Salt and freshly ground black pepper 4 (6-ounce) salmon fillets Cooked pasta or rice Prepare grill by lightly oiling grill grate over medium-high heat In a small saucepan, melt butter add lime juiceSalt and pepper the salmon fillets modestly on both sidesPlace fillets onto grill, brush half of lime butter over salmonGrill salmon for 2 to 3 minutes per side for medium-rareDrizzle remaining lime butter over salmon before servingServe with pasta or rice.
Throw some shredded cheese in a soft tortilla, cook it in a microwave for 45 sec, and dump some taco sauce on a plate, and you've gotta quesadilla.
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500 watts is 500 joules per secondor 1500 joules in 3 secondsso 1500 joules lifts a mass 12 metersE mgh 1500 m9.812 m 12.8 kg it says constant speed, so acceleration is not a factor.

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