Determine the final velocity of one of the objects.For example, the first object may move at a speed of 10 m/s while the second one remains stationary (speed = 0 m/s). Decide how fast the objects are moving before the collision.Let's assume that the first object has a mass of 8 kg while the second one weighs 4 kg. To calculate the velocities of two colliding objects, simply follow these steps: You can use our conservation of momentum calculator to consider all cases of collisions. The potential energy, however, stays the same (which is in line with the potential energy formula). You may notice that while the law of conservation of momentum is valid in all collisions, the sum of all objects' kinetic energy changes in some cases. For example, when a fast-traveling bullet hits a wooden target, it can get stuck inside the target and keep moving with it. Momentum is conserved, but some kinetic energy is lost.
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