45. Review. Two constant forces act on an object of mass m = QC 5.00 kg moving in the xy plane as shown in Figure P7.45. Force F, is 25.0 N at 35.0°, and force F, is 42.0 N at 150°. At time t = 0, the object is at the origin and has velocity (4.00i + 2.50j) m/s. (a) Express the two forces in unit-vector notation. Use unit-vector notation for your other answers. (b) Find the total force exerted on the object. (c) Find the object's acceleration. Now, considering the instant t= 3.00 s, find (d) the object's velocity, (e) its position, () its kinetic energy from fmu, and (g) its kinetic energy from 150 m + EF - A7. (h) What conclusion can you draw by comparing the answers to parts (f) and (g)? 35.0 Figure P7.45

45. Review. Two constant forces act on an object of mass m = QC 5.00 kg moving in the xy plane as shown in Figure P7.45. Force F, is 25.0 N at 35.0°, and force F, is 42.0 N at 150°. At time t = 0, the object is at the origin and has velocity (4.00i + 2.50j) m/s. (a) Express the two forces in unit-vector notation. Use unit-vector notation for your other answers. (b) Find the total force exerted on the object. (c) Find the object's acceleration. Now, considering the instant t= 3.00 s, find (d) the object's velocity, (e) its position, () its kinetic energy from fmu, and (g) its kinetic energy from 150 m + EF - A7. (h) What conclusion can you draw by comparing the answers to parts (f) and (g)? 35.0 Figure P7.45