Abus travels 30km in 1/2h. what is it's average speed in km/h

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

If y gets smaller as x gets bigger and y have an relationship?

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.