Question

) A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. a) What was the bear's average speed

Answer 1

Answer:

$v_{avg} = 5.33\ Km/h$

Explanation:

given,

motion of polar bear

1.0 km south ;  1.0 km east ; 1.0 km north ;  1.0 km west

total time of the trip = 45 min

     $t = \dfrac{45}{60}\ hr$

             t = 0.75 hr

total distance travel by bear = 1 + 1 + 1 + 1 = 4 km

average speed of the bear = ?

$average\ speed = \dfrac{total\ distance}{total\ time}$

$v_{avg} = \dfrac{4}{0.75}$

$v_{avg} = 5.33\ Km/h$

hence,  the average speed of the car is equal to 5.33 Km/h