Recent content by tchen

Totally agree, the same worked for me. And, to take the derivative of 1/2 at^2 + x_0 to realize that it is just at, so that if you forget either but remember one of them you can still easily find the other.

Too nostalgic and classic

If by "that" you mean why it expended force over a small time interval, it's because there was a change in velocity which implies acceleration which implies a force, since F = ma. This is also how you calculate it if you wanted to (not enough info seems to be given in this problem), you just...