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Ans: 40 cm7. A cannonball of mass 50 g, hits a target at 1 km - If resis.tance offered by the target material is 1000 tonne-wt, how far!in the target will the ball penetrate? [lt (tonne) - 10kg.8-10 m.s-2)Ans. 25 cm |
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Answer» this is not answer to your questions but this is similar to your question i think this might help to solve q by your own . Q.A cannon ball (mass = 2 kg) is fired at a target of 500 meters away. The 400 kg cannon recoils by 50 cm. Assuming cannon ball moves with constant velocity, when will it hit the target? [Resistance offered by ground to cannon is 100 N] A. Force by ground on the cannon = 100N. Work done by ground on the cannon = 100 x(0.5) = 50J. Applying conservation of energy work done by ground on canon = Kinetic energy of canon immediately after firing = (1/2) mv2= 50J. Velocity of cannon (v) = 0.5m/sec. By applying law of conservation of momentum 400(0.5) = 2 (velocity of cannon ball) Velocity of canon ball = 100m/sec. Time taken by the canon ball to hit = 500/100 = 5 seconds. |
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