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a) - untuk t = 0
r0 = 40 (0) i + (30.0 - 5.0²) = 0
- untuk t = 4
r1 = 40 (4) i + (30.4 - 5.4²) j = 160 i + 40 j
Δr = 160 i + 40 j
>> Besarnya = √160²+40²
>> arah = tan =
2)
a) v = 6t - 4
- untuk t = 0
v1 = 6(0) - 4 = -4 m/s
- untuk t = 2
v2 = 6(2) - 4 = 8 m/s
Δv = v2 - v1 = 8 - (-4) = 12 m/s
b) v = 6t - 4
- untuk t = 1
v1 = 6(1) - 4 = 2 m/s
- untuk t = 3
v2 = 6(3) - 4 = 14 m/s
Δv = v2 - v1 = 14 - 2 = 12 m/s
cmiiw.