A student walks 160 m in 150. The student stops for 30and then walka 210 m farther in 140 What is the average speed of the entire walk?
A 0.53 m/
B 0.80 m/s
C 1.2 m/
D 1.3 m/

Average speed = 1.3 m/s

Explanation:

Given that a student walks 160 m in 150 s. The student stops for 30 s and then walka 210 m farther in 140 s.

Neglect the time the student stops.

The total distance covered will be

Distance = 160 + 210

Distance = 370 m

The total time of the whole distance journey will be

Time = 150 + 140 = 290 s

The formula for speed is

Speed = distance/time

Speed = 370/290

Speed = 1.276 m/s

Therefore, the average speed is 1.3 m/s approximately

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

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