Assuming that friction is not present and use the engery tofind the velocity of

Question

Assuming that friction is not present and use the engery tofind the velocity of the (initial stationary) sytem after the 2-kgmass has fallen 2.5m. I have no idea how to do this question. I got this questionwrong and wish to understand so i can get a question similar tothis on the midterm right. Someone please help. I dont understandthese type. Assuming that friction is not present and use the engery tofind the velocity of the (initial stationary) sytem after the 2-kgmass has fallen 2.5m. I have no idea how to do this question. I got this questionwrong and wish to understand so i can get a question similar tothis on the midterm right. Someone please help. I dont understandthese type.

Explanation / Answer

   Potentialenergy   U   =   m * g* h    h   =   heightthrough which the object hasfallen   =   2.5m,   m   =   mass   =   2.0kg    U   =   2.0 *9.8 *2.5   =   49.0   J    According to law of conservation ofenergy    k.e.   =   p.e.    (1/2) * m *v2   =   49.0   J    v   =   (49.0* 2 /2.0)   =   7.0   m/s

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