The economic advisor of a large tire store proposes the demand function d(p)equalsstartfraction 1900 over p minus 40 endfraction , where d(p) is the number of tires of one brand and size that can be sold in one day at price p. answer parts (a) through (e) below. a. recalling that the demand must be positive, what is the domain of this function? the domain consists of all possible values of ▼ for which ▼ p d(p) ▼ does not exist. is positive. is zero. is negative. exists.

a)

b)

c)  

Explanation:

a) Let's calculate the work done by the rocket until the thrust ends.

But we know the work is equal to change of kinetic energy, so:

b) Here we have a free fall motion, because there is not external forces acting, that is way we can use the free-fall equations.

At the maximum height the velocity is 0, so v(f) = 0.

c) Here we can evaluate the motion equation between the rocket at 25 m from the ground and the instant before the rocket touch the ground.

Using the same equation of part b)

The minus sign of 25 means the zero of the reference system is at the pint when the thrust ends.

I hope it helps you!