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    				| 1. | Two balls are thrown upward with velocities 20m/s and 30m/s. What is the ratio of their displacements in last second of their upward motion? | 
| Answer» Answer: DISPLACEMENT during LAST 1s downward journey = displacement during FIRST 1s of upward journey hence REQUIRED ratio = 1:1 s=1/2gt² =5m when g=10m/s² | |