Two objects of the same size will always have the same mass ? is this statement correct

No.  The statement is not correct.  It is incorrect, false, inaccurate, ludicrous, illogical, and absurd.

A balloon that is 80-ft long, 40-ft wide, and 30-ft high when inflated has much less mass than my house has.

Moreover, a small flat rock that is 1 meter long has substantially more mass than the pillow on my bed has.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles