n traveling a distance of 3.4 km between points A and D, a car is driven at 119 km/h from A to B for t seconds and 64 km/h from C to D also for t seconds. If the brakes are applied for 3.1 seconds between B and C to give the car a uniform deceleration, calculate t and the distance s between A and B.

A train which is traveling at 75 mi/hr applies its brakes as it reaches point A and slows down with a constant deceleration. Its decreased velocity is observed to be 55 mi/hr as it passes a point 1/2 mi beyond A. A car moving at 50 mi/hr passes point B at the same instant that the train reaches point A. In an unwise effort to beat the train to the crossing, the driver "steps on the gas." Calculate the constant acceleration a that the car must have in order to beat the train to the crossing by 3.3 sec and find the velocity v of the car as it reaches the crossing. Tw Answers: a = i V = i Train 75 mi/hr 1.0 mi 1.1 mil B Car 50 mi/hr ft/sec² mi/hr

Current Attempt in Progress The speed of a car increases uniformly with time from 63 km/h at A to 103 km/h at B during 8 seconds. The radius of curvature of the hump at A is 60 m. If the magnitude of the total acceleration of the mass center of the car is the same at B as at A, compute the radius of curvature pg of the dip in the road at B. The mass center of the car is 0.74 m from the road. Assume PA = 60 m, h = 0.74 m. Answer:PB = m B PB

4. Starting from rest, the motorboat travels around the circular path, p= 50-m, at a speed v = 0.8t m/s, where 't' is in seconds. Determine the magnitudes of the boat's velocity and acceleration when it has p- S0m traveled 20-m.