A train travels with a speed of 72km/hr retards at rate of 2m/s2 then time taken and distance travelled before coming to rest
Answers
Answer:
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Explanation:
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Answer:
Time Taken = 10s
Distance Travelled = 100m
Explanation:
Given -
u = 72km/h = 20m/s
a = -2m/s^2
v = 0 ( As the train comes to rest )
Acceleration = Change in Velociy/Time
=> a = v-u/T
=> -2 = 0 - 20/T
=> -2 = -20/T
=> T = -20/-2 = 10s
Hence the time taken is 10s
v^2 - u^2 = 2as (Formula)
=> 0^2 - (20)^2 = 2 × (-2) × s
=> -400 = -4 × s
=> s = -400/-4 = 100m
Hence the distance travelled before coming to rest is 100m