A 150-N box is being pulled horizontally in a wagon accelerating uniformly at 3.00 m/s2.
The box does not move relative to the wagon, the coefficient of static friction between the box and the wagon's surface is 0.600, and the coefficient of kinetic friction is 0.400. The friction force on this box is closest to
A) 450 N.
B) 90.0 N.
C) 60.0 N.
D) 45.9 N.
Question 2
A batter hits a foul ball. The 0.140-kg baseball that was approaching him at 40.0 m/s leaves the bat at 30.0 m/s in a direction perpendicular to the line between the batter and the pitcher.
What is the magnitude of the impulse delivered to the baseball? A) 9.80 Ns
B) 1.40 Ns
C) 3.50 Ns
D) 5.60 Ns
E) 7.00 Ns
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