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fcb
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Homework Statement
A rocket moving towards Alpha Centuari at 1000ms^-1 fires its rockets, accelerating backwards at a constant rate for 5 minutes. During this 5 minutes, the rocket moved 240km close to the star. What was the acceleration?
Homework Equations
I have no idea what formula you should use
Maybe:
r= ut + 1/2at^2
The Attempt at a Solution
Hmm , i'll tell you my attempt , but srsly this question is hard
r = ut + 1/2at^2
r = 240 km = 240000 m
u = 1000m/s
t = 5 mins = 300s
a = ?
240000 = 1000 x 300 + 1/2 x a x (300)^2
240000 = 300000 + 45000a
= - 6000 = 45000a
a = -6000/45000
a = -0.133m/s/s towards the star ...