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- 7. A particle moves along the x axis according to the equation x=6t, where x is in meter and t is in second, the speed of the particle is: 2 m/s 6 m/s 4 m/s 12 m/s A B DIn m/s?, what is the acceleration when t = 7.5 sec? Express your answer as an integer, not as a fraction. 20 15 10 10 15 25 t(sec) -5 -10 -15 -20 v(m/sec) 201039. A car accelerates for t sec from rest to a velocity of 48 ft per sec, the accelera- tion increasing uniformly from zero to 12 ft per sec?. During the next 4 sec, the car decelerates at a constant rate to a velocity of 4 ft per sec. Sketch the a-t, v-t, and 8-t curves.
- 43. In a women's 100-m race, accelerating uniformly, Laura takes 2.00 s and Healan 3.00 s to attain their maximum speeds, which they each maintain for the rest of the race. They cross the finish line simultaneously, both setting a world record of 10.4 s. (a) What is the acceleration of each sprinter? (b) What are their respective maximum speeds? (c) Which sprinter is ahead at the 6.00-s mark, and by how much? (d) What is the maximum distance by which Healan is behind Laura, and at what time does that occur?1 1 2 3 4 5 6 t(s) By how much does the velocity change between t = 1 s and t = 5 s? It decreases by 2 m/s It increases by 2 m/s It decreases by 1 m/s It changes by 5 m/s O It increases by 1 m/s 4. 3. (s/u) AAn object's velocity is i = (1.0 )t²i + 3.0mj. What is the object's acceleration at t=2.0s? т
- 6. Consider the velocity-time graph shown below. Which section has the smallest v (m/s) D LA + + + 1 2 3 4 5 6 7 8 9 B 4 3 2 1 -1 -2 -3 -4 t(s) magnitude of velocity? know Explain how you this using only words (no calculations)A toy car starts from rest and reaches a speed of 5.13[m/s] in 1.13[s]. How far did the car travel in that time? Express your answer in meters.A car traveling at 20 m/sm/s runs out of gas while traveling up a 9.0 degree slope. How far will it coast before starting to roll back down? Express your answer in meters.
- 1. Calculate the speed for a car that went a distance of 125 kilometers in 2 hours time. ▶Car's speed:From a velocity of 65 kph, a train decelerates at a rate of 3 m/min2 along a straight path. How far in meters will it travel after 14 mins? 14873.158 m 18753.148 m 15873.148 m O 17843.158 m16. A train changes its speed uniformly from 60 mi/hr to 30 mi/hr in a distance of 1500 ft. What is its acceleration?