Adriver traveling at 100 km/hr notices the speed limit changes to 50 km/hr when he is entering town. he takes 0.9 second to slow down to 50 km/hr with constant acceleration. we want to know how many meters the driver travels while slowing down.

50 points to the person who gets it right
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B)

Explanation:

In order to find the distance covered by the driver while slowing down, we can use the following suvat equation:

where

is the distance covered

v is the final velocity

is the initial velocity

t is the time

For the car in this problem,

t = 0.9 s

Substituting,

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

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