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12. A ball is thrown vertically upwards with speed u. Ifit experiences a constant air resistance force ofmagnitude f, then the speed with which ball strikesthe ground, (weight of ball is w) isW+f1/2(1) V = uW - f1/2((w-f)(w+f)(2) v= u1/22(w +f)u(3) v=(W-f)1/2(W+f)2(w-f).(4) V = u |
| Answer» 12. A ball is thrown vertically upwards with speed u. Ifit experiences a constant air resistance force ofmagnitude f, then the speed with which ball strikesthe ground, (weight of ball is w) isW+f1/2(1) V = uW - f1/2((w-f)(w+f)(2) v= u1/22(w +f)u(3) v=(W-f)1/2(W+f)2(w-f).(4) V = u | |