How much horsepower is expended for a 120 lb person to climb a set of stairs 1100 centimeters high and 300 centimeters long in 7 seconds

At time t=0, a particle is located at the point (3,6,9). it travels in a straight line to the point (5,2,7), has speed 8 at (3,6,9) and constant acceleration 2i−4j−2k. find an equation for the position vector of the particle.

Ineed the answer to question 1 , i’m desperate

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?