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Example 1:
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Given: vi = 0
vf = 40.0 m/s
t = 10. s
Need: a
Formula: a = vf - vi
t
(2 sig figs)
a) a = (40 - 0)/10 = 4.0 m/s2
b) Given: vi = vf from last part = 40.0 m/s
Need: vf
t = 5.0s
a = 4.0 m/s2
Formula: a = vf - vi
t
4 = vf - 40
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a) Given: vi = 30. m/s
a = -2.0 m/s2
vf = 15 m/s
2 sig figs
Formula: vf2 = vi2 + 2ad
152 = 302 + 2 (-2)d
225 = 900 - 4d
subtract 900
-675 = -4d
divide by -4
Need: d
b) Given: vi = 30. m/s
a = -2.0 m/s2
vf = 0
Need: d
Formula: vf2 = vi2 + 2ad
0 = 302 + 2(-2)d
0 = 900 -4d
4d = 900
d = 225 = 230 m
d = 168.75 = 170 m
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