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CBSE Class 9 Answered

A motorcyclist along with machine weighs 180 kg.While riving at 90 km/hr, he stops his machine over a distance of 10 m.Calculate the retarding force of the brakes ?
Asked by Vikas | 10 Jul, 2017, 12:21: AM
answered-by-expert Expert Answer
begin mathsize 12px style Given space that colon straight m space equals space 180 space kg straight u space equals space 90 space km divided by hr space equals space 25 space straight m divided by straight s straight s space equals space 10 space straight m We space first space calculate space the space acceleration space using space the space formula straight v squared space minus space straight u squared space equals space 2 as 0 space minus space left parenthesis 25 right parenthesis squared space equals space 2 space cross times space straight a space cross times space 10 rightwards arrow negative 625 space equals space 20 space straight a therefore space straight a space equals space minus space 31.25 Retarding space force space is space given space as straight F space equals space ma rightwards arrow space straight F space equals space 180 space cross times space open parentheses negative space 31.25 close parentheses space rightwards arrow space straight F space equals space minus space 5625 space straight N end style
Answered by Yashvanti Jain | 10 Jul, 2017, 11:10: AM

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CBSE 9 - Physics
A boy of mass 45 kg running 6 m/s jumps onto a 30 kg trolley moving in the same direction at 1.5 m/s. Their common velocity will be: A. 4.0 m/s B. 4.2 m/s C. 6.5 m/s D. 8.3 m/  
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Two hockey players of opposite teams, while trying to hit a hockey ball on the ground collide and immediately become entangled. One has a mass of 60 kg and was moving with a velocity 5.0 m s–1 while the other has a mass of 55 kg and was moving faster with a velocity 6.0 m s–1 towards the first player. In which direction and with what velocity will they move after they become entangled? Assume that the frictional force acting between the feet of the two players and ground is negligible.
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CBSE 9 - Physics
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Asked by neeteshvarshney6 | 20 Jul, 2020, 04:20: PM
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CBSE 9 - Physics
please answer fast
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Asked by tapandash1974 | 16 Jul, 2020, 05:39: PM
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Asked by neha14072006 | 21 Jun, 2020, 08:15: PM
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Asked by pnegi9416 | 29 Apr, 2020, 10:00: AM
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The mass of a cannon is 500 kg.  From this cannon a bullet of 10 kg mass was thrown at a speed of 20 m / s.  How long does a cannon retreat if the resistance of the land is one tenth the weight of the cannon?
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