A ball rolls downhill with a constant acceleration of 4 m/s2. If it started from rest, its velocity at the end of 3 meters is__
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2. A ball rolls downhill with a constant acceleration of 4 m/s2. If it started from rest, its velocity at the end of 3 meters is__.
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- O -1.08 x 10^8 m/s^2 O -1.08 x 10^6 m/s^2 O 1.08 x 10^6 m/s^2 O 1.08 x 10^8 m/s^23. Pilots of high-performance aircraft risk loss of consciousness if the undergo accelerations exceeding about 5g. For a military jet flying at 2470 km/hr (about twice the speed of sound), what is the minimum time it takes the jet to reverse its direction in a circular turn while keeping the acceleration below the 5g safety threshold?A stone is dropped from rest near the surface of moon. The velocity of the stone after 3 seconds is [Given data : acceleration due to gravity of moon, 9moon = 1.6m/s2,acceleration due to gravity of earth, gearth = 9.8 m/s²] O a. +29.4m/s O b. -4.8m/s O c. -29.4m/s O d. +4.8m/s
- 6. A ball is thrown upward with a velocity of 4.5 m/s. Its speed and the magnitude of its acceleration at the highest point (a) are both equal to zero (b) are given by 9.81 m/s and 0 m/s², respectively (c) are given by 0 m/s and 9.81 m/s², respectively (d) cannot be predicted unless the height is known Answer: 7. Which of the following statements about a projectile is not true? Assume that the air resistance is negligible. (a) Its motion is in two dimensions. (b) The only acceleration is in the vertical direction. (c) Its velocity in the horizontal direction remains the same throughout the flight. (d) The velocity at the highest point of its trajectory is zero. Answer:9. Figure 2 below shows the velocity of a particle as a function of time. (a) Find the acceleration for the five one-second periods and plot the acceleration as a function of time. (b) Taking x = 0 at t = 0, find the position of the particle at t 0.5 s, t = 1.0 s, t = 2.0 s, t = 3.0 s, t = 4.0 s, and t 5.0 s and plot the position as a function of time. Look at the slopes of your x vs t curve for the five one-second periods and show that they correspond to the velocities of Fig. 2. 15.0- 10.0 5.0 0.50 1.00 1.50 2.00 2.30 S.00 350 4.50 3.00 -5.0t -ם.םו- Fig 2 -15.0A cheetah can accelerate from rest to a speed of 25.5 m/s in 5.00 s. What is its acceleration (in m/s2)? (Enter a number.)