In a straight line Subject: PHYSIC a. 6m 12. A car moving with a speed of 50km h can be stopped applying brakes after moving atleast 6m. If the same car moving at a speed of 100km h - the minimum stoppin distance is b. 12m C. 18m d. 24m 13. A bullet fired into a wooden block loses half of its velocit after penetrating 40cm. It comes to rest after penetrating a further distance of a. cm cm da
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Given, u=50km/hr=50×
18
5
=
18
250
m/s
v=0
s=6m(at least)
By third equation by motion,
v
2
=u
2
+2as
0=(
18
250
×
18
250
)+2(−a)(s)
0=192.90−12a
a=
12
192.90
=16.07
Now applying third equation of motion,
v
2
=u
2
+2as
⟹0=(100×
18
5
)
2
+2(−16.07)(s)
⟹0=771.60−32.14s
⟹s=
32.14
771.60
=24.00
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