Which of these changes do not involve forming or breaking chemical bonds? a) burning and melting b) rusting and cutting c) burning and digestion d) boiling and melting

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Asher cycles 12 miles in 16 hours. what is his speed?

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)