Final velocity with constant acceleration
A car moving at 5 m/s accelerates at a constant 3 m/s² for 4 s. What is its final speed?
Answer B: explanation for every choice
A
This is only the change in speed (at), without the starting 5 m/s.
B
Correct. v = v₀ + at = 5 + (3)(4) = 17 m/s.
C
44 m is the distance traveled in those 4 s, not the speed.
D
This uses at² instead of at: 5 + 3(16) = 53.
Takeawayv = v₀ + at when time is given.
Equation usedVelocity with constant acceleration
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