Alex who has a mass of 100-kg skateboards at 10.0 m/s smacks into a brick wall and comes to a dead stop in 0.2 s. His sudden deceleration is
A. ?500 m/s2.
B. ?5.0 m/s2.
C. ?50 m/s2.
D. ?9.8 m/s2.
Answer: C
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?
?
?
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