ILoveLucy1
New member
- Mar 25, 2009
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north is slowed down uniformly...? 1.) A 2015 kg car traveling to the north is slowed down uniformly from an initial velocity of 20 m/s by a 6250 N braking force acting opposite the car's motion.
a) What is the car's velocity after 2.5 s?
b) How far does the car move during the 2.5 s?
c) How long does it take the car to come to a complete stop?
2.A pitcher claims he can throw a 0.161 kg baseball with as much momentum as a speeding bullet. Assume that a 3.6 g bullet moves at a speed of 1.5 x 103 m/s.
a) What must the baseball's speed be if the picther's claim is valid?
b) Which has a greater kinetic energy, the bal or the bullet?
a) What is the car's velocity after 2.5 s?
b) How far does the car move during the 2.5 s?
c) How long does it take the car to come to a complete stop?
2.A pitcher claims he can throw a 0.161 kg baseball with as much momentum as a speeding bullet. Assume that a 3.6 g bullet moves at a speed of 1.5 x 103 m/s.
a) What must the baseball's speed be if the picther's claim is valid?
b) Which has a greater kinetic energy, the bal or the bullet?