You throw an object at a 45 degree angle at a fast speed 2 meters above the ground. The object reaches its maximum height in 15 seconds, and then falls back down. Do you know how long it will take to go from the max point to 2 meters above the ground:

It will take 15 seconds.

Explanation:

Since the acceleration due to gravity is a constant, the motion is exactly symmetric. This means that the time an object lasts to travel a distance when it goes upwards, is the same time in which it will cover the same distance downwards. So, as the object reaches its maximum height in 15 seconds from a point 2 meters above the ground, it will take another 15 seconds to go from the highest point to that altitude.

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts