Explanation Introduction: The speed of an object defines how fast the object is moving with respect to time. It gives the magnitude of the velocity of the object. The units of speed are km/h , m/s and so on. The expression for the speed is: speed = distance travelled time Explanation: Reason for the correct option: Consider the situation mentioned in the problem. It is mentioned that the car is moving at 60 km/h initially and comes to a stop after 10 s when the brakes are applied. This means that the initial speed of the car is 60 km/h and its final speed is 0 km/h . Thus, 60 km/h denotes the initial speed. Hence, option (c) is correct. Reason for the incorrect options: Option (a) is incorrect because average speed is defined as the ratio of the total distancetravelled by the moving object and the elapsed time

10th Edition

ISBN: 9780073513898

Author: Bill Tillery

Publisher: MCGRAW-HILL HIGHER EDUCATION

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Units and Dimensions

These are generally defined as the terms which precede or describes the dimensions further. These are also further divided into two parts namely fundamental units and the derived units.

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Chapter 2, Problem 4AC

To determine

The term used for 60 km/h when the car moving at this speed comes to a stop in 10 s after the brakes are applied from the following options:

Average speed

Final speed

Initial speed

Constant speed

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Chapter 2, Problem 3AC

Chapter 2, Problem 5AC

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The term used for 60 km/h when the car moving at this speed comes to a stop in 10 s after the brakes are applied from the following options: Average speed Final speed Initial speed Constant speed

Solution Summary: The author explains that the speed of an object defines how fast the object is moving with respect to time.

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The term used for 60 km/h when the car moving at this speed comes to a stop in 10 s after the brakes are applied from the following options: Average speed Final speed Initial speed Constant speed

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Chapter 2 Solutions

The term used for 60 km/h when the car moving at this speed comes to a stop in 10 s after the brakes are applied from the following options:

Average speed

Final speed

Initial speed

Constant speed