Answer
We can rank the objects by their speeds, from largest to smallest:
$c = d \gt a = b = e$
Work Step by Step
(a)
$F=ma$
$a = \frac{F}{m}$
$v_a = 0+at_1 = \frac{F~t_1}{m}$
(b)
$2F=(2m)~a$
$a = \frac{2F}{2m} = \frac{F}{m}$
$v_b = 0+at_1 = \frac{F~t_1}{m}$
(c)
$F=ma$
$a = \frac{F}{m}$
$v_c = 0+a~(2t_1) = \frac{2F~t_1}{m}$
(d)
$2F=ma$
$a = \frac{2F}{m}$
$v_d = 0+at_1 = \frac{2F~t_1}{m}$
(e)
$F=(2m)a$
$a = \frac{F}{2m}$
$v_e = 0+a~(2t_1) = \frac{F~(2t_1)}{2m} = \frac{F~t_1}{m}$
We can rank the objects by their speeds, from largest to smallest:
$c = d \gt a = b = e$
