A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver
steps on the brake pedal. What must the car's deceleration be if the car is to stop just before it reaches the
A car is travelling along the road at 8 m
then travelling?
Child ?
ANSWERS
5. Distance
Answers
Answered by
2
Answer:
Initial velocity, u=20m/s
Final velocity, v=0m/s
Distance, s=50m
Using relation, v
2
=u
2
+2as
0
2
=(20)
2
+2×a×50
0
2
=400+100a
−400=100a
a=
100
−400
=−4m/s
2
The car's deceleration must be 4m/s
2
.
Answered by
0
Answer:
Initial velocity, u=20m/s
Final velocity, v=0m/s
Distance, s=50m
Using relation, v
2
=u
2
+2as
0
2
=(20)
2
+2×a×50
0
2
=400+100a
−400=100a
a=
100
−400
=−4m/s
2
The car's deceleration must be 4m/s
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