134. a vehicle lands on mars and explores its surface. the average gravitational field on the surface of mars is 3.7 n/kg. the weight of the vehicle is defined as the gravitational force exerted on it. which of the following statements are true about the vehicle's weight? select two answers. (a) the vehicle's weight was constant until it reached the surface of mars. (b) the vehicle's weight increased while it was descending to the surface of mars. ( c) the vehicle's weight always equals the normal force exerted by mars on the vehicle while it is landing, (d) the vehicle weighs less on the surface of mars than on the surface of earth.

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.