In two angle ABC and angle DEF, if area of angle ABC/area of angle DEF =AB²/DE² =9/4 then angle ABC=angle DEF
class 9 science , physics ch-4 work and energy A body is given a velocity of 30m/s.It colloids with a wall and rebounds with a velocity of 20m/s .What amount of it's energy can be converted to heat energy if it's mass is 100 grams?