In traveling a distance of 3.2 km between points A and D, a car is driven at 96 km/h from A to B for t seconds and 59 km/h from C to D also for t seconds. If the brakes are applied for 6.0 seconds between B and C to give the car a uniform deceleration, calculate t and the distance s between A and B. 96 km/h 59 km/h B 3.2 km Answers: t = i S = i km
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- please answer all parts of the questionA tourist being chased by an angry bear is running in a straight line toward his car at a speed of 6.25 m/s. The car is a distance d away. The bear is 21.3 m behind the tourist and running at 8.64 m/s. The tourist reaches the car safely. What is the maximum possible value for d? Vbear Number i Vtourist UnitsA car traveling 56.0 km/h is 23.0 m from a barrier when the driver slams on the brakes. The car hits the barrier 2.05 s later. a) What is the magnitude of the car's constant acceleration before impact? b) How fast is the car traveling at impact?
- A train is traveling south at 58.4 m/s when the brakes are applied. It slows down with constant acceleration to a speed of 6.00 m/s in a time of 9.00 s. How far does the train travel during the 9.00 s? If the displacement is toward north, enter a positive value. If the displacement is toward south, enter a negative value. answer in mA high speed train travels through a station without slowing. An accordionist playing on the platform notices that the pitch of the train's horn is different as it approaches compared to the pitch after it has passed. Furthermore she notices that the ratio of the frequencies is 3/2. 6. Find a value for the speed of the train. 7. The accordionist also notices that when the train is precisely 14.4 m away from her the sound level is 110 dB. Find a value for the time after it passes the station when the sound level is 50 dB.An object moves in the x-y plane with a constant acceleration of 2i +3j meters per second squared. The object starts at the origin with some initial velocity. After four seconds (4 seconds) the velocity of the object is 2i + 8j meters per second. Determine the object’s initial velocity. Leave answer in i-j notation. Determine the position of the object at time, t = 4 seconds. Leave answer in i-j notation. Thank you for your help.
- An object moves along the x axis according to the equation x = 2.80t² (a) Determine the average speed between t = 1.60 s and t = 2.80 s. m/s (b) Determine the instantaneous speed at t = 1.60 s. m/s Determine the instantaneous speed at t = 2.80 s. m/s (c) Determine the average acceleration between t = 1.60 s and t = 2.80 s. m/s² (d) Determine the instantaneous acceleration at t = 1.60 s. m/s2 -2.00t+3.00, where x is in meters and t is in seconds. Determine the instantaneous acceleration at t = 2.80 s. m/s2 (e) At what time is the object at rest?A car traveling at 33.0 km/h speeds up to 45.0 km/h in a time of 7.00 s. The same car later speeds up from 63.0 km/h to 75.0 km/h in a time of 7.00 s. Let the +x direction point in the direction the car is traveling. Calculate the magnitude a, of the constant acceleration for the first time interval. Determine the distance de traveled by the car during the first time interval. Calculate the magnitude ay of the constant acceleration for the second time interval. m/s² m/s² E