Help on science questions please!

Yes

Explanation:

since the masses of the two objects are the same their gravitational potential energy will be the same.

potential energy= m×g×h

for example if the masses of both objects is 5kg and they are 5 m above the ground.

the potential energy= 5×5×10=250joules

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.