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a) vektor kecepatan
v = (50 + 4t)i + (8t)j
b) vektor percepatan
a = 4i + 8j
c) saat t = 10 sekon
r = (50.10 + 2.10²)i + (4.10²)j
= (500 + 200)i + 400j
= 700i + 400j
| r |² = 700² + 400²
= 490.000 + 160.000
= 650.000
| r | = √650.000
= 100√65 meter
semoga membantu ya :)