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| 1. |
A body travels 30m in 5 th second and 80m in 7th second of its motion. Find the distance travelled in the 9th second of its motion. |
| Answer» 2X +4(2x+7)=3(2x+4)2x + 8x + 28=6X + 1210x + 28 = 6x +124x + 28= 124x=-16x=-4 | |