Physics, asked by jagadishwar1114, 24 days ago

Find the time taken by a car to travel 5.4 km moving with 20m/s.

Answers

Answered by Anonymous
0

Answer:

If questions be like “velocity, distance”, you should always try to counter with

v^2 - u^2 = 2as

If possible.

Here, it is. A car moving at 20m/s is to be stopped in 40m of distance travelled. So:

0^2 - 20^2 = 2a(40)

-400/2*40 = a

-5m/s^2 = a

As we've found the retardation, we can easily use

v = u + at

0 = 20 - 5t

4 = t

So, we need 4s to satisfy the given conditions spot on.

PS

Funny that some people try to use

s = ut + at^2/2

After finding the accel, which only overcomplicates things.

Answered by krmoham1234
0

Answer:

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Explanation:

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