Concept explainers
To identify: whether the object’s speed or velocity is given or not.
Explanation of Solution
Given:
The world record for the hundred-meter dash is about 10 m/s.
Speed of wind is 30 km/h from the north-west.
Mass of the train is 200000 kg and the speed of the same train is 70 km/h.
Speed of the car is 140 km/h on the interstate.
Calculation:
Speed signifies only magnitude while velocity indicates both magnitude and direction.
(a) Speed
The world record for the hundred-meter dash is about 10 m/s.
(b) Velocity
Speed of wind is 30 km/h from the north-west.
(c) Velocity
A 200000 kg train was traveling north at 70 lm/h when it derailed.
(d) Speed
A car was issued a ticket for travelling at 140 km/h on the interstate.
Conclusion:
Hence, all are identified.
Chapter 2 Solutions
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
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