NCERT Class 9 Science Chapter 4 Describing Motion Around Us Solutions
NCERT Class 9 Science Chapter 4 Describing Motion Around Us Solutions Think It Over (Page No. 48) 1. How much distance should we maintain from the truck ahead to avoid a collision if it suddenly applies the brakes? Answer: We should maintain a safe distance so that if the truck suddenly applies brakes, our vehicle has enough distance to stop and avoid collision. This stopping distance depends on: the speed of our vehicle braking ability road conditions driver’s reaction time So, there is no fixed number; the distance should be sufficient for safe stopping. 2 .Does this distance depend upon the speed with which we are moving? Answer: Yes, this distance depends on speed. When speed is higher, the stopping distance is more When speed is lower, the stopping distance is less The book explains that when brakes are applied, a vehicle travels some distance before stopping, and this distance increases with higher initial velocity. Pause and Ponder (Page No. 51) 1. In the example of an athlete...