题目内容：

a)Find the equation for the Velocity of a particle that travels along x-axis governed by the position function:
s(t)=t2-3t-10
b)What is the starting position for the particle?
c)In what direction is the paticle traveling at t=1 sec?
d)At what time(s) does the particle change direction
难道就没有一个人会吗?

优质解答

a.2t-3 take derivative of s(t);b.(0,-10)?plug t=0 into the function;c.v=1-3-10=-12,towards negative infinity;d.t=1.5,when speed reaches 0 the partical reaches its maximum travel displlacement,hence se...