Question

A Car travelling at 20m/s takes a u-turn after 20 seconds without changing its speed , what is the average acceleration of the car

Answer 1

Answer:

-2m/s²

Explanation:

We have :-

→ Initial speed (u) = 20 m/s

→ Time taken (t) = 20 seconds

→ The car takes a U-turn.

→ Speed remains same.

To find :-

→ Average acceleration (a) .

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As the car takes a U-turn, this means it is changing the direction of it's motion. So it's final speed (v) will be = -20 m/s

Now, let's calculate the average acceleration of the car by using the 1st equation of motion.

v = u + at

⇒ -20 = 20 + a(20)

⇒ -20 - 20 = 20a

⇒ -40 = 20a

⇒ a = -40/20

⇒ a = -2 m/s²