If earth were twice as massive but remained the same size, what would happen to the value of g?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?