A train moves east with a speed of 45 m/s a man on the train walks west with a speed of .4 m/s relative to the train how long does it take the man to move 10m relative to the train?

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

What force is responsible for making fusion possible in the sun? a- gravitational force b- electromagnetic force c- weak nuclear force d- strong nuclear force

Regarding the history of the universe, which of the following is true? all the chemical elements were created during the big bang, but some have been modified since that time as a result of radioactive decay. the earth formed quickly after the big bang. all the current stars in our galaxy formed about the same time billions of years ago. key elements of which earth and life are made, including carbon, oxygen, and iron, did not exist when the universe was born and were created later in stars.