Question

A mass of 10 kg us dropped from height 1\2 m . Find its (a) velocity and (b) kinetic energy as just it reaches the ground

Answer 1

Answer:

V= √9.8

K.E=49J

Explanation:

For downward motion under gravity

Vf=0m/s

using 3rd equation of motion

2gS=Vf²-Vi²

g=9.8m/s²

2x9.8x0.5=0-V²

√9.8=V

K.E=1/2 mv²= 1/2 x 10 x (√9.8)²= 5x9.8= 49J