CBSE PHYSICS: Enrich your study: IX:Force and laws of motion sol... : CBSE PHYSICS: IX:Force and laws of motion solved Problems 1. An athlete runs a certain rest before taking a long jump. Why? Solution: An... CBSE PHYSICS: IX:Force and laws of motion solved Problems 1. An athlete runs a certain rest before taking a long jump. Why? Solution: An athlete runs a certain distance to accelerate himself and gain enough momentum so that he can jump through the maximum possible length. 2. Springs are provided in car seats. Why? Solution: The springs in the car seats absorb shock (sudden jumps) due to the roughness of the road. Thus, making the ride more comfortable. 3. A gun of mass 1500 kg fires a shell of mass 15kg with velocity 150 m/s. calculate velocity of recoil of the gun. Solution: Before firing, total momentum of the gun and shell is = 0 (they were all at rest) After firing, the momentum of the shell = 15 X 150 = 2250 Ns The momentum of the gun is = 1500v Ns By conservat
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