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Remember F = ma, so a=F/m.
Cart 1 has acceleration = F/m = 199/35 = 5.686m/s²
Cart 2 has acceleration = F/m = 19/75 = 0.253m/s²
So cart 1 has the bigger acceleration.
The time is not used.
If you want to work out the final velocities (which is *not* part of the question):
v = at = (F/m)t, so your formula is correct,
Cart 1's velocity after 11s = 5.686 x 11 = 62.5m/s
Cart 2's velocity after 15s = 0.253 x 15 = 3.8m/s
Don't foget to include units with your values or you lose marks.
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