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Acceleration = d²x/dt² = -8 + 6t. Find acceleration after 4 sec.

1. 16 m/s²
2. 12 m/s²
3. 8 m/s²
4. 4 m/s²

Correct answer: 12 m/s²

Solution

To find the acceleration at t = 4 seconds, substitute t = 4 into the given equation: a = -8 + 6t. This gives a = -8 + 6(4) = -8 + 24 = 16 m/s².

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