ICSE Class 9 - Physical Quantities Related to Motion Videos

• a car travels 100km at a speed of 60km/h and returns at a speed of 40km/h calulate the average speed for the whole journey
• Can the three simultaneous velocities of 2, 3 and 7 units keep a body at rest? Give reason for vour answer.
• Giving reason state if a body having three simultaneous velocities 2u, 3u and 6u can have their resultant velocity zero.
• please give answer of this question
  
• How it becomes 36*(5/18)
• explain retardation in detail
• Why are we multiplying 90km/h by 5/18 ?  
• what does the negative sign of acceleration indicate?
• examples for speed is constant but direction changes
• examples for speed changes direction remains constant

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