Two Cannonballs Are Dropped from a Second Floor Physics Lab $\frac { h } { 4 }$

question 29

Multiple Choice

Two cannonballs are dropped from a second floor physics lab at height h above the ground.Ball B has four times the mass of ball A.When the balls pass the bottom of a first floor window at height $\frac { h } { 4 }$ above the ground,the relation between their kinetic energies,K_A and K_B,is

• A)K_A = 4K_B.
• B)K_A = 2K_B.
• C)K_A = K_B.
• D)K_B = 2K_A.
• E)K_B = 4K_A.

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