A steel ball of mass 5 g is thrown downward with a velocity of 10 ms⁻¹ from a height of 19.5 m and it penetrates sand by 50 cm. The change in mechanical energy will be (take, g = 10 ms⁻²)
A 1J
B 1. 25 J
C 1.5 J
D 1.75 J