Velocity = displacement (distance)/time
v=80m/4s
v=20m/s
velocity = 20 meters per second
His velocity is 3 m/s in the direction in which he is running in. which.
Answer:
Here are some uses...
Explanation:
Uses of convex mirror:
It is used in supermarkets and stores for surveillance.
It it is used as rear view mirror in automobiles.this is due to the reason that a convex mirror provides a wider field of view than a plane or concave mirror.
Uses of concave mirror:
It is used in torches.
They are used in headlights of vehicles to send parallel rays to infinity , in shaving mirror to get an enlarged image of the face and also by dentists to see a bigger image of the tooth / teeth .
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C. Quarts watches is the correct answer