Question
A 100 gram bullet is fired at an angle of 75 degrees above the the horizontal...
A
100 gram bullet is fired at an angle of 75 degrees above the the
horizontal from the top of a 45 meter tall building with a speed of
60 m/s. Assume no air resistance acts on the bullet and take zero
gravitational potential energy to be at ground level.
A) What is the height of the bullet, measured above the
ground, when 40% of the bullet’s total energy is kinetic
energy?
B) What is the greatest amount of gravitational potential
energy of the bullet?
Homework Answers
Answer #1
Find the height required using the total energy of bullet at the
point of launch which will be constant due to absence of air
resistance as shown below. Potential energy is highest when kinetic
energy is lowest which happens when speed of bullet is lowest which
happens at maximum height where only horizontal component of
velocity remains.
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