A 1.5-kg object moving along the x axis has a velocity of +4.0 m/s at x = 0. If

Question

A 1.5-kg object moving along the x axis has a velocity of +4.0 m/s at x = 0. If the only nice acting on this object is shown in the figure, what is the kinetic energy of the object at x = +3.0m? 18 j 21 j 23 j 26 j 8 j justification A 10-kg bullet moving horizontally with a speed of 1.8 k.m/s strikes and passes through a 5.0=kg block initially at rest on a horizontally frictionless surface. The bullet emerges from the block with a speed of 1.0 km/s. What is the kinetic energy of the block immediately after the bullet emerges? 8.0 j 6.4 j 5.3 j 9.4 j 10 j justification:

Explanation / Answer

Change in Kinetic Energy = Work Done = Net Area K.E - 0.5*1.5*4^2 = (0.5*2*8-0.5*4*1) K.E. = 18 J

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