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Example 9.7 A girl of mass 40 kg jumpswith a horizontal velocity of 5 m s ontoa stationary cart with frictionlesswheels. The mass of the cart is 3 kg.What is her velocity as the cart startsmoving? Assume that there is noexternal unbalanced force working inthe horizontal direction.Solution:

Answer» <p> no external force =&gt; momentum is constant.</p><p> momentum of girl = 40 * 5 = 200 kg-m/sec momentum of girl and cart = total momentum of the girl + momentum of cart = 200 + 0 = 200 kg m/sec speed = 200 / (40 + 3) = 4.65 m/sec</p>


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