A.\(2\)
B.\( - 4\)
C.\( - 2\)
D.\( - 2i\)

A.\(2\)
B.\(4\)
C.\(1\)
D.\(3\)

A.\(8\)
B.\(7\)
C.\(4\)
D.\(6\)

A.889
B.89
C.1000
D.1159

A.3
B.5
C.16
D.12

A.\(9,80{\rm{ }}m/{s^2}.\)
B.\(9,84{\rm{ }}m/{s^2}.\)
C.\(10{\rm{ }}m/{s^2}.\)
D.\(9,81{\rm{ }}m/{s^2}.\)

A.17,5cm.
B.15cm.
C.20cm.
D.22,5cm.

A.\(4\)
B.\(2\)  
C.\(\sqrt 6 \)  
D.\(\sqrt 7 \)

A.487nm.
B.464nm.
C.456nm.
D.542nm.

A.50 cm
B.52 cm.
C.53 cm.
D.51 cm.