A force F = (8 î – 5 ĵ) N acts on a particle that undergoes a displacement Ař = (4 î + ĵ) m. (a) Find the work done by the force on the particle. J (b) What is the angle between F and Ar?

A force of F= (263 N)E -(125 Nj acts on an objeut, causing a displacement of Āp =(3.15 m) î + (2.81 m) . %3D What is the work done on the object?

An uncontrolled 850 kg car strikes squarely a motorway crash cushion in which the car is brought to rest by successively crushing steel barrels. The length of the crash cushion is 5.9 m, and the magnitude F of the force required to crush the barrels as a function of the distance the car has moved into the cushion is given by  (image attached) a) Determine an expression for the work done by the force Fas a function of x b) If the car strikes the crash cushion with a velocity of 38km / h , determine the distance the car will move into the cushion before it comes to rest and the maximum deceleration of the car. c) Determine the maximum velocity with which the car can strike the cushion so that it will not hit the wall behind the cushion.

A force F→ is applied to a 2.0 kg, radio-controlled model car parallel to the x-axis as it moves along a straight track. Calculate the work done by the force F→ when the car moves from x = 0 to x = 3.0 m. Calculate the work done by the force F→ when the car moves from x = 4.0 m to x = 7.0 m.