Question
- A projectile of mass m is fired horizontally with an initial speed of v0 from a height of h above a flat, desert surface. Neglecting air friction, at the instant before the projectile hits the ground, find the following in terms of m, v0, h, and g.
- (a) the work done by the force of gravity on the projectile W =
- (b) the change in kinetic energy of the projectile since it was fired ΔKE =
- (c) the final kinetic energy of the projectile KEf =
- (d) Are any of the answers changed if the initial angle is changed? Yes No
Answer
a)The work done will be equal to the PE: W = m g h
b)Since there is no frictional forces present delta KE = m g h
c)KEf = KE + PE KEf = 1/2 m v0^2 + mgh
d)No
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