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a) Evaluate the following calculation, giving your answer rounded to 3 decimal places: (3.41 + 7.95)³ x (317- 150) ½/2 b) Explain the steps you have taken in the calculation and why. c) A car of mass 900kg (m) is travelling at a speed of 12 metres per second (v₁) on a level road when the brakes are applied due to a level crossing. It is slowed down smoothly to a speed of 4 metres per second(v₂)over a distance of 710 metres. i) calculate the work done, W, during the braking process using the formula: w = 1/2m(v₂₁² - v₂²) ii) Calculate the force applied by the brakes using the braking force (F) and distance travelled (s) formula, giving your answer rounded to 3 significant figures:
Sagot :
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