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प्रश्न
Boojho walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is
विकल्प
8.3
7.2
5
3.6
MCQ
उत्तर
7.2
Explanation:
Average speed = `"Total distance"/"Time taken"`
= `((3 + 3)"km")/((1/2 + 1/3)"h)"`
= `6/(5/6)`
= `36/5`
= 7.2 km/h
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संबंधित प्रश्न
Average speed of a moving object is equal to the magnitude of its average velocity when it travels.
Match the following:
| a. | Uniform motion. | i. | Body having uniform acceleration |
| b. | Non-uniform motion. | ii. | Body at rest. |
| c. | The velocity-time graph is a circle. | iii. | Unequal distance covered in equal interval of time. |
| d. | Straight-line parallel to time axis in the position-time graph. | iv. | Equal distances covered in equal intervals of time. |
| e. | Straight-line inclined to 45° with a time axis is a velocity-time graph. | v. | Not possible. |
