Question

Brakes are applied to a car moving with
disengaged engine, bringing it to a halt
after 2s. Its velocity at the moment
when the breaks are applied if the
coefficient of friction between the road
and the tyres is 0.4 is
1) 3.92 ms-
2) 7.84 ms)
3) 11.2ms-
4) 19.6 ms-​

Answer 1

Step-by-step explanation:

ANSWER

We have:

Frictional force =ma

μmg=ma=

t

mv

∴v=μgt

=0.4×9.8×2=7.84 m/s

Answer 2

Answer:

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