Arock with a mass of 0.3 kg falls from the top of a cliff. if it takes the rock 2.5 s to reach the ground, what was the impulse on the rock during the fall?

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.