Question

(55m) at 10.30 am (255m) at 10.32 am __________A___________________B___________ The average speed of a body in the above diagram is a)16.67 m/s b)1.67m/s c) 0.167 m/s d) 166.7m/s

Answer 1

Answer:

v = u + a*t , u = 0 because it starts from rest

a = 100/10 = 10 m/s²

Distance is v² - u² = 2*10*s , u=0 , v=100

s = 100*100/2*10 = 500 m

Total distance is 500 + 100*10 = 1500 m

Average velocity is 1500/(10 + 10) = 1500/20 = 75 m/s

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Answer 2

Given: (55m) at 10.30 am (255m) at 10.32 am

To find: The average speed of a body.

Solution: The average speed of a body is 1.67 m/s.

In order to calculate the average speed of a body, the total distance that is covered by the body must be divided by the total time taken by the body to cover the distance. This statement could be written as an equation as shown below.

$speed = \frac{distance}{time}$

The total distance covered by the body can be calculated as

$255 - 55 = 200 m$

Now, the total time taken by the body can be calculated as

$10:32 - 10:30 = 2 minutes$

                         $= 120 seconds$

Thus, the average speed is

$speed = \frac{200}{120}$

         $= 1.67 m/s$

Therefore, the average speed of a body is 1.67 m/s.