$5.(2$p$.)$ A projectile with a mass $2\mathrm{.}4$kg is fired from a cliff $125$m high with an initial velocity of $150$m$/$s$,$ directed $41$ above the horizontal. What are a$)$ the kinetic energy of the projectile just after firing and b$)$ its potential energy? c$)$ Find the speed of projectile just before it strikes the ground.