A55kg cannonball is fired out of a 1500kg cannon with an acceleration of 18m/s/s. with what acceleration did the cannon recoil?

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

Will you chech and finish these for me, because i am stumped with them.

Which one of the following research methods can show cause and effect