Question

Answer the following questions:
1. On a foggy day two drivers spot each other when they are just 80 metres apart.
They are travelling at 72km/h ánd 60 km/h respectively. Both of them applied
brakes retarding their cars at the rate of 5 m/s2. Determine whether they avert
collision or not?​

Answer 1

Answer:

s=80m

v1=72*5/18=20m/s

just like that

v2=50/3m/s

so velocity of v1 with respect to v2=20+50/3

=110/3 m/s

a1=-5m/s^2=a2

so retardation with respect to other=5+5=10m/s^2

so s=(v^2-u^2)/2a

=0-(110/3)^2/(-2*10)

1210/18=67.22m

so 67.22<80 m

so collision won't take place.

Explanation:

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