A motorboat traveling on a straight course slows uniformly from 65 km/hkm/h to 30 km/hkm/h in a distance of 40 mm .     Part A What is the magnitude of the boat’s acceleration?

At highway speeds, a particular automobile is capable of an acceleration of about 1.8 m/s². Part A At this rate, how long does it take to accelerate from 55 km/h to 120 km/h? Express your answer to two significant figures and include the appropriate units.

just part c

Coasting due West on your bicycle at 9.6 m/s, you encounter a sandy patch of road 6.7m across. When you leave the sandy patch your speed has been reduced by 3.8m/s to 5.8 m/s. a. Assuming the sand causes a constant acceleration, what was the bicycle’s acceleration in the sandy patch? Give both the magnitude and direction. b. How long did it take to cross the sandy patch? c. Suppose you enter the sandy patch with a speed of only 7.6 m/s. Is your final speed in this case 3.4m/s, more than 3.4m/s, or less than 3.4 m/s? Explain.

In this problem, you will apply kinematic equations to a jumping flea. Take the magnitude of free-fall acceleration to be 9.80 m/s². Ignore air resistance. Part A A flea jumps straight up to a maximum height of 0.410 m. What is its initial velocity vo as it leaves the ground? Express your answer in meters per second to three significant figures. ▸ View Available Hint(s) 20 2.83 m/s Submit ✓ Correct Part B Previous Answers How long is the flea in the air from the time it jumps to the time it hits the ground? Express your answer in seconds to three significant figures. ► View Available Hint(s) time in air = Submit 1951 ΑΣΦ Previous Answers Request Answer wood ? S

Please answer parts a-c

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant (net) acceleration 44.1 m/s². The acceleration period lasts for time 8.00 s until the fuel is exhausted. After that, the rocket is in free fall. Part A Find the maximum height ymax reached by the rocket. Ignore air resistance and assume a constant free-fall acceleration equal to 9.80 m/s². Write your answer numerically in units of meters. Ymax = V—| ΑΣΦ ? m

Part A At an air show, a jet plane has velocity components v₂ = 725 km/h and v₁ = 455 km/h at time 4.85 s and v = 843 km/h and vy = 385 km/h at time 7.47 s. For this time interval, find the component of the plane's average acceleration. ΑΣΦ ax = 45.04 ? km/h² You have already submitted this answer. Enter a new answer. No credit lost. Try again. Submit Previous Answers Request Answer Part B For this time interval, find the y component of the plane's average acceleration. ΑΣΦ ay = -26.72 Submit Previous Answers Request Answer × Incorrect; Try Again Part C ? km/h² For this time interval, find the magnitude of its average acceleration. a = ΑΣΦ Submit Request Answer Part D ? km/h² For this time interval, find the direction of its average acceleration. θα ΑΣΦ ? ° clockwise from +x axis

A small object moves along the x-axis with acceleration a₂ (t) = -(0.0320 m/s³) (15.0 s-t). At t=0 the object is at x = -14.0 m and has velocity Voz = 8.20 m/s. Part A What is the x-coordinate of the object when t = 10.0 s? Express your answer with the appropriate units. x= μА Value 4 m ? X Incorrect; Try Again; 2 attempts remaining

ng A woman is on a train leaving the station at 3.0 m/s, while a friend waving goodbye runs alongside the car she's in. Call the train's direction of motion the + direction. ▼ Part B Once the train has reached a speed of 10 m/s, how fast must the woman walk, and in which direction, to keep up with her friend? Express your answer with the appropriate units. VIw= Submit μÀ Value 3 @ m S O Previous Answers Request Answer Review ?