A train starts from rest with a constant acceleration 3 m/s2 for 5 seconds. Now it moves with a constant speed for the next 300 seconds and finally retards to come to rest again in the next 15 seconds.
i) What is the maximum speed of the train?
ii) What is the retardation produced in the train?
iii) What is the total distance moved by the train?
iv) What is the average velocity of the train?
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Answer:
Total distance covered(s) = Distance during acceleration(s
1
) + distance during uniform motion(s
2
) + distance during retardation(s
3
)
For acceleration,
v=u+a∗t
v
max
=2×10=20 m/s
s=ut+(1/2)at
2
s
1
=(1/2)×2×10
2
=100 m
For uniform motion,
s=vt
s
2
=20×200
=4000 m
During retardation,
v=u+at
0=20+50t
=−0.4 m/s
2
s
3
=ut+(1/2)at
2
=20×50+(1/2)×(−0.4)×50
2
=500 m
Total distance travelled, s=s1+s2+s3=100+4000+500=4600 m
Total time taken, t=t
1
+t
2
+t
3
=260 s
Average velocity, v
avg
=
Total Time
Total Distance
=4600/260=17.69 m/s
Step-by-step explanation:
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