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AP Physics
mgh=1/2mv^2, solve for the variable v
asked by Lisa on August 1, 2010 
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A 6.0kg block is released from rest 80m above the ground. When it has fallen 60m its kinetic energy is: I got 1200J as my answer mgh=(6.0*9.81* 60m)=3531.6 PE + KE= (ME + KE) 3531.6 + KE= (6.0*9.81*80m) KE= 1177.2 is that right A
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a patrol boat took 2.5 hours for a round trip 12km upriver and 12km back. the speed of the current was 2 km/h. what was the speed of the boat in still water? ps: i just need to know how to make equations from the question above.
asked by lawrence on October 15, 2010 
physics
Solve the equations 1 2 mv2 + 1 2 Iω2 = mgh and v = rω for the speed v using substitution, given that I = mr2 and h = 4.20 m. (Note that mass m and radius r will both cancel, so their numerical values aren't required.)
asked by alba on March 6, 2015 
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A curling rock with a mass of 20.0kg slides down a sheet of ice at a speed of 60.0 m/s. What is the kinetic energy of the curling rock? Uhmm, i think the formula is.. Ek= 1/2mv2 Solve?
asked by chyanne on April 29, 2008

Physics
Determine the ratio of the relativistic kinetic energy to the nonrelativistic kinetic energy (1/2mv2) when a particle has a speed of (a) 2.12 x 103c. and (b) 0.959c.
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solve systems of equations by graphing... I get how to graph and solve equations but i just don't understand why its coming out wrong u=v 4u=3v3
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A train leaves Danville Junction and travels north at a speed of 75 km/h. Two hours later, a second train leaves on a parallel track and travels north at 125 km/h. How far from the station will they meet? I have no idea what the
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the diagram shows a skateboarder starting a run from Position P (2.5m) at 2.6 m/s. The mass of the skateboarder system (boarde + board) = 74.5kg. Assume that frictional forces can be ignored. a)calculate the speed of the
asked by Sarah N H on January 30, 2010
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