Question

How long does it take a car to accelerate from 20 m/s to 40 m/s if it accelerates at 5 m/s² ?

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Answer 1

Explanation:

(40)*2-(20)*2=2×5×s

1600-400=10×s

s=120

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Answer 2

Answer:

$\huge{ \pink{answer}{} }{}$

• Given that
• u = 30m/s
• v = 40m/s
• a = 5m/s ^2
• 5m/s² means that the velocity increase each second is 5 m/s. So 4 s of that acceleration would increase the speed from 20 to 40.
• Since the acceleration is uniform during those 4 s, we can use the simple average speed of 30 m/s. 30 m/s * 4 s = 120 m.
• So distance = 120 metre
• Hope it helps