Answer to Question #234621 in Mechanics | Relativity for Stanley

Question

A stone of mass 0.5kg is thrown vertically upwards with a velocity of 10m/s , find
a. P.E at the greatest height
b.the kinetic energy on reaching the ground, assuming g=10m/s and neglecting air resistance

Answer 1

initial velocity v = 10 m/s

mass of the ball m = 0.5 kg

acceleration due to gravitation g =10 m/s

a) Potential energy at a height h assuming datum at the initial point = m*v

$= 0.5 × 10 = 5J$

b) Initial kinetic energy of the ball $=0.5×m×v×v= 0.5×0.5×10×10 = 25 J$