Kinetic energy physics question!?

Question

A pitcher throws a baseball towards home plate. The baseball, which has a mass of 145 g approaches the plate with 122 J of kinetic energy. Calculate the speed of the baseball and show please please, thanks.

Answer 1

Equation for kinetic energy:

Ek = (1/2) mv^2

122J = (1/2) (0.145 kg) v^2

v^2 = 1682.7586 (m^2/s^2)

v = 41.0 m/s

Answer 2

mass of the baseball m=145g=0.145kg

kinetic energy of the baseball 1/2 mv^2=122J

or, v^2=(2 x 122J)/m=244J/0.145kg

or, v=sq.root of 244J/0.145kg=41.02m/s

Answer 3

145 g=0.145kg

KE=0.5mv^2

KE=0.5(0.145)v^2

KE=(0.0725)v^2

122/0.0725=v^2

1,682.76=v^2

41.02 m/s=v