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Chapter 5 - 5.64

second law F 1 + F 2 = ma where m =2 . 0kg.

F 1 =20i in Newtons. In each case, we use Newton’s

(a)If a =+10i in SI units, then the equation above gives F 2 =0.

(b)If a =+20 ˆ im/s 2 , then that equation gives F 2 =20 ˆ iN.

(c)If a = 0, then the equation gives F 2 =

−

20 ˆ iN.

(d)If a =

−

10 ˆ im/s 2 , the equation gives F 2 =

−

40 ˆ iN.

(e)If a =

−

20 ˆ im/s 2 , the equation gives F 2 =

−

60 ˆ iN.

64. We take rightwards as the + x direction. Thus,