# What is the speed after the first two 2.00s of acceleration?

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an airplane manufacturer claims that his commuter jetpak will accelerate at a constant rate from rest to a speed of 250 km/hr in 4.00s.

asked Dec 16, 2013

From the given information, we can figure out the acceleration. $$\Delta v=a\Delta t$$
Then reapply the relation $\Delta v=a\Delta t$ with the $a$ found above and the time of 2.0s. The outcome should be 125 km/h.