Yes, if weather was hot you need more fluids in your body due to the sweat pores needing to cool you down.
I need to write 20 characters but your answer is Joule
Ek = 1/2 mv^2
If they are travelling at the same speed the one with the larger mass will have more kinetic energy as kinetic energy and mass are proportional.
Acceleration = change in velocity/change in time
= (30 - 20) / 10 - 0
= 10 / 10
Acceleration = 1 m/s²
I believe your answer is d).
Hope you find this helpful! :)
