2D Kinematics: astronaut ballplayer

[dharmank]

An astronaut in his space suit can throw a ball a maximum distance dmax = 14 m on the surface of the earth.
a) For a given speed of the ball, what angle to the horizontal q (in degrees) will yield the greatest range?

q = 45 OK

b) If the ball is thrown at this same angle q, what speed will produce this greatest range (14 m) ?

v = 14.54 m/s NO

c) How far can he throw the ball on a planet where g1 = 18 m/s2?

xp =9.81*14/18 m OK

d) What height will the ball reach on this "maximum range" trajectory? (on the planet where g1 = 18 m/s2)

hmax = 12 m NO

HOW DO YOU SOLVE PART B AND D?
An explanation of the process would be great

 

[Kurdt]

It would be useful for helpers if you'd shown your working. It would then be easier to identify the problems you are having. I presume you are familiar with the kinematic equations?

https://www.physicsforums.com/showthread.php?t=110015