detailed please show work too

5. Jacob car engine applies a 13 500 N [Forward] force to accelerate his car from 84 km/h [Forward] to 120 km/h [Forward] in 6.5 seconds as he merges onto the Queensway. If his car has a mass of 1430 kg, determine the force of friction that the car experienced.(application- 5marks) 6. Determine the equivalent resistance of the following circuits(application-4marks) R1 = 2.0 0 R2= 4.0 0 R3 = 6.0 0 R4 = 3.0 0 AV= 24 V Question III Communication:(10marks) 7. Richard is driving home one afternoon when he slams on the brakes to stop for a crossing cyclist. (communication-4marks) a) Describe in which direction (forwards or backwards) Richard will probably fall, and explain why using one of Newton's Laws. b) Which safety feature(s) in a car protect him from getting hurt in this situation? 8. Jasmine, who is always in great mood in the morning, arrives in class singing. If the frequency of the sound waves she is producing is 874 Hz, and the speed of sound in our classroom is 348 m/s, determine: a) The temperature in our classroom. b) The wavelength of the sound waves. c) The length of a closed tube that would produce the second resonant length.(communication-6marks)