Physics problems on Energy

1. A stone of mass 0.5 kg is projected vertically upwards with an initial velocity of 4.0ms^-1. What is its kinetic energy when it reaches a height of 0.5m?

2. http://i48.tinypic.com/iyj0a9.png (both questions)

I couldn't load the Physics Help Forums website. Hope posting in here is just as fine, since it says in the description 'chemistry and physics'.

use conservation of energy principles in both questions ...

Quote:

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1. A stone of mass 0.5 kg is projected vertically upwards with an initial velocity of 4.0ms^-1. What is its kinetic energy when it reaches a height of 0.5m?

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initial kinetic energy = gravitational potential energy + final kinetic energy

http://i48.tinypic.com/iyj0a9.png

1. initial total mechanical energy - work done by friction = final total mechanical energy



solve for

2. you can answer this question