an object starting from rest travels 20 m in first 2 seconds and 150 in the next 4. what will be the velocity after 7s in the start
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For first 2 seconds
S = ut + 0.5at^2
S = 0.5at^2 ...... [∵ u = 0]
a = 2S / t^2
a = (2 * 20) / 2^2
a = 10 m/s^2
For first 7s
S = 0.5 at^2 ..... [∵ u = 0]
= 0.5 * 10 * 7^2
= 245 m
Distance travelled in first 7s is 245 m
Velocity after 7s from start = sqrt(2aS)
= sqrt(2 * 10 * 245)
= 70 m/s
Velocity after 7s from start is 70 m/s
S = ut + 0.5at^2
S = 0.5at^2 ...... [∵ u = 0]
a = 2S / t^2
a = (2 * 20) / 2^2
a = 10 m/s^2
For first 7s
S = 0.5 at^2 ..... [∵ u = 0]
= 0.5 * 10 * 7^2
= 245 m
Distance travelled in first 7s is 245 m
Velocity after 7s from start = sqrt(2aS)
= sqrt(2 * 10 * 245)
= 70 m/s
Velocity after 7s from start is 70 m/s
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