Projectile Motion MC (1 Viewer)

[spatula232]

From 2002 JR Trial:
During a visit to the moon an astronaut throws a rock vertically and it reaches 20m. Acceleration due to gravity on moon is 1.6m.s^-2.
What is the speed it is thrown at?
a) 25.3m/s
b) 62.6m/s
c) 640m/s
d) 3920m/s

For some reason I kept getting 8m/s...

 

[Fizzy_Cyst]

From 2002 JR Trial:
During a visit to the moon an astronaut throws a rock vertically and it reaches 20m. Acceleration due to gravity on moon is 1.6m.s^-2.
What is the speed it is thrown at?
a) 25.3m/s
b) 62.6m/s
c) 640m/s
d) 3920m/s

For some reason I kept getting 8m/s...

Must be a typo. Answer is 8 for those values, however, if it was 200 rather than 20, answer would be A

 

[spatula232]

awesome thanks

 

[Silly Sausage]

Either the answers are off or there was a typo.