Question #7009d

1 Answer
Dec 13, 2017

118.2 " Joules"

Explanation:

Work done = change in energy

E_1 = (1/2)*m*v_1^2

E_2 = (1/2)*m*v_2^2

E_2 - E_1 = (1/2)*m (v_2^2 - v_1^2)

m = 19.7" kg", v_1 = 2m//s, v2 = 4 m//s

E_2 - E_1 = (1/2)*19.7(4^2 - 2^2)

E_2 - E_1 = (1/2)*19.7(16 - 4)

E_2 - E_1 = (1/2)xx19.7xx12

E_2 - E_1 = 6xx19.7

E_2 - E_1 = 118.2 " Joules"