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March 4, 2015

March 4, 2015

Posted by **Anonymous** on Wednesday, April 16, 2008 at 1:10pm.

just te1l me what direction to go in please.

2)A car of mass 1330 kg is traveling at 28.0 m/s. The driver applies the brakes to bring the car to rest over a distance of 79.0 m. Calculate the retarding force acting on the car.

(79.0/28.0)*1330

3752.5

- physics -
**tchrwill**, Wednesday, April 16, 2008 at 1:53pmAssume the ball starts its upward flight from the top of the throwers head, 1.75m above the ground.

1--Time to maximum height above the thrower's head derives from Vf = Vo - 9.8t or 0 = 5.376 - 9.8t making t(up) = .548sec.

2--Time back to the top of the throwers head is also .548sec. and the velocity the same as the departure velocity, 5.376m/s.

3--The time to reach the ground from the height of 21 + 1.75 = 22.75m = Vot + 9.8t^2/2 or 4.9t^2 + 5.376t - 22.75 = 0.

4--Solve for t using the quadratic formula.

5--Having t, the horizontal distance traveled becomes 14.004(.548 + .548 + t)

- physics -
**Anonymous**, Wednesday, April 16, 2008 at 2:14pm15.3

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