Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert
if it brought a 1200-kg car (a so-called compact model) to a rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph). (Bumpers are built with springs that compress to provide a stopping force without, hopefully, denting the metal.)
A) 1.8 × 104 N
B) 1.6 × 104 N
C) 5.4 × 104 N
D) 6.5 × 105 N
E) 3.2 × 104 N
B
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A 2.0-kg block slides on a frictionless 25° inclined plane. A force of 4.6 N acting parallel to the incline and up the incline is applied to the block. What is the acceleration of the block?
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