Question

A dog runs from one side of a park to the other 80.0 meters across and takes 16.0 seconds to cross the park. What is the speed of the dog?

Answer 1

Explanation:

speed =distance/time

v=80m/16s

v=5m/s

Answer 2

Given :

• A dog runs from one side of a park to the other 80.0 meters across and takes 16.0 seconds to cross the park.

To find :

• Speed of the dog.

Solution :

• Distance (d) = 80.0 meters
• Time (t) = 16.0 seconds

Formula used :-

${\boxed{\sf{Speed (s)=\dfrac{Distance (d)}{Time (t)}}}}$

$\to\sf{Speed(s)=\dfrac{80.0\: meters}{16.0\: seconds}}$

$\to\sf{Speed (s)=5.0\:m/s}$

Therefore, the speed of the dog is 5.0 m/s.

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Additional information :-

★ Distance = Speed × Time

★ $\sf{Time=\dfrac{Distance}{Speed}}$

★ Relation between distance, speed and time :

•Speed and time are inversely proportional. (when distance is constant)

• $\sf{Speed\propto\dfrac{1}{Time}\:[When\: distance\:is\: constant]}$

★ Relative Speed :-

If two objects are moving in the same direction at $\sf{v_1}$ m/s and $\sf{v_2}$ m/s respectively where $\sf{v_1}$> $\sf{v_2}$, then their relative speed =$\sf{(v_1-v_2)\:m/s}$.