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Samuel Oti

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If 6.0g of carbon is heated in air,the mass of the product obtained could be either 22.0g or 14.0g depending on the amount of
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A body which is uniformly retarded comes to rest in 10 s after travelling a distance of 20m.calculate its initial velocity
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Pls explain more i did not understand see how i did it before but was wrong.v^2=u^2+2as. 0=u^2+2×-10×20. 0=u^2-20×20. 0=u^2-400. 400=u^2. u^2=square root of 400.which is 20.but i still failed it.
Pls i need response for the question
Since the bullet is in motion =k.e.ke=1/2*m*v^2.first convert the 20g to its unit kg.divide 20 divide 1000 =0.02.1/2*0.2*150^2=225 joules
since the question say's neglect air resistance.8*100.energy at first phase=800.then energy at second phase =40*100=4000.therefore total energy =4000+800=4800 joules

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