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A police van moving on a highway with a speed of36 km/hr fires a bullet at a thief's car speeding awayin the same direction with a speed of 108 km/hrIf the muzzle speed of the bullet is 140 m/s, withwhat speed will the bullet hit the thief's car?18.(1) 120 m/s(3) 140 m/s(2) 130 m/s(4) 150 m/s |
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Answer» Speed of the police van, Vp = 36 km/h = 10 m/sMuzzle speed of the bullet, Vb = 140 m/sSpeed of the thief's car, Vt = 108 km/h = 30 m/sSince the bullet is fired from a moving van, its resultant speed can be obtained as: = 140+10 = 150 m/sSince both the vehicles are moving in the same direction, the velocity with which the bullet hits the thiefs car can be obtained as:Vbt = Vb - Vt= 150 - 30 = 120 m/s |
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