an amusement park designer wants his swing to have a centripetal acceleration of 21m/s^2 . if the velocity of the swing is 13m/s , how long should the chain in the swing be

Which type of reaction is shown in this energy diagram? energy products activation energy reactants time o a. endothermic, because energy is released to the surroundings o b. exothermic, because energy is absorbed from the surroundings o c. exothermic, because energy is released to the surroundings o d. endothermic, because energy is absorbed from the surroundings