11. A car starts and accelerates at a constant 4 m/s? in 1 second. Determine speed and distance after 10 seconds.
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- 27. Starting at time t = 0, an object moves along a straight line with velocity in m/s given by v(t) = 98 – 2t², where t is in seconds. When it momentarily stops its acceleration is: А. 0 B. -4.0 m/s² С. -9.8 m/s² D. -28 m/s? E. 49 m/s? ans: D39. A car starts from rest and travels for 5.0 s with a uni- form acceleration of +1.5 m/s². The driver then applies the brakes, causing a uniform acceleration of -2.0 m/s?. If the brakes are applied for 3.0 s, (a) how fast is the car going at the end of the braking period, and (b) how far has the car gone?4. A Porsche challenges a Honda to a 400 m race. Because the Porsche's acceleration of 3.5 m/s² is larger than the Honda's 3.0 m/s², the Honda gets a 1.0 s head start. Who wins? By how many seconds?
- 5. DETERMINE THE STOPPING DISTANCES FOR A CAR WITH AN INITIAL SPEED OF 95km/h AND A HUMAN REACTION TIME OF 1.0 s, FOR AN ACCELERATION OF............. (A) a=-4.0 m/s², (B) a= -8.0 m/s² (Hint: First, convert 95 km/h to m/s)13. A boy walks 155 m at a speed of 3.5 m/s and then runs for 100 m at 8.2 m/s along a straight line. Calculate his average velocity. 14.A boat can accelerate from 2 to 21 km/h in 10 s. How far has the boat travelled in this time?4. A race car accelerates uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds. Determine the acceleration of the car and the distance traveled.
- 1. A car traveling 75 km/h slows down at a constant acceleration of 0.50 m/s^2 just by “letting up on the gas.” Calculate (a) the distance the car coasts before it stops, (b) the time it takes to stop. 2. A horse trots away from its trainer in a straight line, moving 38 m away in 9.0 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate (a) its average speed and (b) its average velocity for the entire trip, using “away from the trainer” as the positive direction. 3. At highway speeds, a particular automobile is capable of an acceleration of about 1.8 m/s^2. At this rate, how long does it take to accelerate from 65 km/h to 120 km/h? 4. In coming to a stop, a car leaves skid marks 65 m long on the highway. Assuming a deceleration of 4.00 m/s^2, estimate the speed of the car just before breaking. 5. A baseball is hit almost straight up into the air with a speed of 25 m/s. Estimate (a) how high it goes, (b) how long it is in the air.2. The graph shows the speed-time graph of a car travelling on a straight road. The car slows down as it approaches a town and accelerates again after passing through it. The road the car travels is straight throughout the whole journey. 29 Speed (m/s) 14 14 29 35 time (s) a. Find the distance the car traveled in town. b. Find the acceleration of the car after passing through the town.5. Your motion along the x-axis begins at rest and at x= 0. The motion consists of acceleration at 2.00 m/s2for 10.0 s, a time period of 6.00 seconds with no acceleration, and then deceleration at -1.00 m/s2for 20.0 s resulting in a final speed of zero. The total distance traveled is 420 m. What is the average speed during this motion? Give answer to 3 significant figures. Help solve this problem, thanks!
- 4. Julie is walking around a track at a 2m/s for some exercise. She then decides to start jogging so she accelerates at a rate of 0.5m/s² for 3 seconds. How far did Julie travel from the time she started to accelerate to the end of the 3 seconds?2. Two cars are drag racing. The red car accelerates at a rate of 4.7 m/s', and the blue car at a rate of 3.9 m/s’. The blue car starts 1.5 s before the red. Find the time it takes for the red car to be at the same position as the blue car, how the cars have traveled, and how fast each is moving at this time.5. An object moving along the x-axis has its position given by the equation x= 2.0t2 – 3.0t +4 with x inmeters and tin seconds. What is the acceleration of the object at time t= 4.0s?