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 projectileW = (b) the change in kinetic energy of the projectile since it was firedΔKE = (c) the final kinetic energy of the projectileKEf = (d) Are any of the answers changed if the initial angle is changed?YesNo

Answer 1

We will have the following:

a)

`W=(1)/(2)mv_0^2`

b)

`\Delta K_E=mgh-(1)/(2)mv_0^2`

c) Yes, if the angle changes then the components of the velocities change, and thus the energy.