Originally Posted by

**craigmain** Hi,

I have just completed a set of problems using the chain rule, and have come across one I am very confused about.

Given K=1/2mvv

(v squared)

m = 10grams

v = 30cm/second

accel = 5cm/s/s

what rate is K changing. I don't know how to go about applying the chain rule to the function. I have tried differentiating with respect to m, then with respect to v and multiplying by vv (v squared) and m respectively.

The answer is 1500. I can't figure out the middle step. I am guessing that accel of 5m/s/s is not required. There is no accel in the formula.

Thanks

Regards

Craig.