Plz me with my science

when you throw a ball straight toward another person during a game of catch, why does it follow a parabolic path instead of following a straight, horizontal path?

a.
because not enough potential energy exists for the ball to reach its mark.

b.
because the catcher has too little universal gravitational attraction for the ball.

c.
because gravity is the only continuous force acting on the ball.

d.
because, while two continuous forces are acting on the ball, gravity is the strongest.

Alexander calder's mobiles are an example of motion because it uses forces of wind and water.

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.