In traveling a distance of 3 km between points A and D, a car is driven at 100 km/h from A to B for t seconds and 60 km/h from C to D also for t seconds. If the brakes are applied for 4 seconds between B and C to give the car a uniform deceleration, calculate t and the distance s between A and B.
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- Compute your Average velocity in the following two cases: (a) You walk 61.4 m at a speed of 2.47 m/s and then run 61.4 m at a speed of 3.34 m/s along a straight track. (B) You walk for 1 minute at a speed of 2.47 m/s and then run for 1.8 minutes at 3.34 m/s along a straight trackIn coming to a stop, a car leaves skid marks 77 mm long on the highway. Assuming a deceleration of 4.30 m/s2m/s2 , estimate the speed of the car just before braking. Express your answer using two significant figures.A, B and C are points on the same straight line such that AB = 60 m andAC = 80 m. An object moves from A to B at an average speed of 10 m/s, then goes from B to C in 4 seconds. The object then returns to B. The average speed for the whole journey is 5 m/s. (i) Find the average speed from B to C. (ii) Find the average speed from A to C. (iii) Find the time taken to go from C to B. (iv) Find the average velocity for the whole motion.
- An astronaut on the Moon (g=1.62 m/s2) throws a rock from the ground level with a speed of 32.1 km/h directly upwards. Determine the time after which the rock reaches the height equal to three quarters of its maximum height on the way down.Provide your answer with the precision of two places after the decimal.In traveling a distance of 4.6 km between points A and D, a car is driven at 105 km/h from A to B for t seconds and 40 km/h from C to D also for t seconds. If the brakes are applied for 5.3 seconds between B and C to give the car a uniform deceleration, calculate t and the distances between A and B. Answers: t = S= 105 km/h i IM B 4.6 km 40 km/h S kmA car traveling 52.7 km/h is 24.2 m from a barrier when the driver slams on the brakes. The car hits the barrier 1.93 s later. (a) What is the car's constant deceleration magnitude before impact? (b) How fast is the car traveling at impact?
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