A baseball is moving in the air along the customary parabola. Ignoring air drag, where is the force on the baseball zero?
A) at the top of the parabola
B) just when it has started upward
C) where it is about to impact
Two baseballs are released at the same time. One is dropped from rest and the other is given an initial horizontal velocity. Which of the following is not true? Ignore atmospheric drag.
A) Both baseballs hit the ground at the same time.
B) Both have the same vertical component of velocity as they reach impact.
C) The horizontal component of velocity increases at a greater rate than the vertical component of velocity for both while they are both in the air.
D) The horizontally-released ball has a greater speed than the other ball for the whole trip.
A projectile is launched at an angle less than and at speed v. Which will increase the projectile's range more, ignoring atmospheric drag?
A) doubling the launch angle
B) increasing the speed of launch by 50%
C) reducing the mass of the projectile
D) launching on February 29th
A projectile is launched with speed v at an angle , the angle being less than . What other angle would give the same range for this projectile launched at the same speed v?