You throw a baseball straight up in the air so that it rises to a maximum height much greater than your height. Is the magnitude of the ball’s acceleration greater while it is being thrown or after it leaves your hand? Explain.

7. The height of a helicopter above the ground is given by h =20.0 t-5.0 t where h is in meters and t is in seconds. At t=1.00 s, the helicopter releases a small mailbag. a) What is speed of a mailbox before hint to the ground? b) How long mailbox in air? 8. Starting from rest at 5 m from origin, a small still ball's horizontal component of velocity is 90.0 mile/hour in a straight line in 10.0 s. Ball's acceleration is constant during the entire motion, what is ball's final position?

#2) For this problem, ignore air resistance and assume the magnitude of the acceleration due to gravity is equal to 9.80 m/s². Let's also use up as the positive direction. Report answers to 3 sig figs. ECANSU (A) A rocket, initially at rest on the ground, accelerates straight upward from rest with constant net acceleration of 32.8 m/s2. The acceleration period lasts for a time of 3.47 s until the fuel is exhausted. Find the height the rocket reaches in the first 3.47 s. Show starting equations, algebra first, show final equations, numbers last. (B) After 3.47s, the fuel runs out and the rocket is now in free fall as it continues its motion. Find the total maximum height the rocket reaches as measured from the ground. Show starting equations, algebra first, show final equations, numbers last.

4. You wake up in a strange room, with opaque walls, and no visible doors or windows. you drop a ball from a height of 1.12 m and it hits the floor 0.191 s after you drop it. This time you suspect you are on a rocket that has just left the surface of the Earth, and is still not too far above the ground. What do you deduce the rocket s acceleration to be?     71.2 m/s^2     61.4 m/s^2     98.0 m/s^2     51.6 m/s^2

Problem 6: An airplane takes off and flies upward at an angle of 23° with a constant speed of 256 m/s. While the plane is flying upward, a piece of the engine falls off when the plane reaches a height of 880 m. (While not part of the problem, assume the plane eventually lands safely.) Part (a) How long does it take the piece of the engine to reach the ground? Give your answer in seconds. Numeric : A numeric value is expected and not an expression. t = Part (b) What is the horizontal distance covered by the piece of the engine before it lands? Give your answer in meters. Numeric : A numeric value is expected and not an expression. d =

@ 2 9. An object initially at rest experiences an acceleration of 1.90 m/s² for 6.50 s then travels at that constant velocity for another 9.90 s. What is the magnitude of the object's average velocity over the 16.4 s interval? m/s F2 10. A person is driving along a straight highway at a speed of 22.0 m/s when the traffic light which is 43.0 m ahead turns yellow. Because of his "reaction time", there is a delay of 0.15 s before the man steps on the brake. The car then slows with a deceleration of 4.20 m/s2. By how much distance does the driver miss the traffic light line? # 3 80 F3 $ 200 F4 m % 5 F5 ^ 6 Submit Assignment MacBook Air & 7 ◄◄ F7 CO * 8 DII FB ( F9 ) 0 A F10 F11 +11 = 4) 品 F12 } delete

An astronaut exploring a distant solar system lands on a planet with a gravitational acceleration of 7.46 m/s2. What is the maximum height an astronaut could reach when jumping straight up starting with an initial speed of 1.80 m/s?

A particle leaves the origin at t =0s with an initial velocity v_0 = 3.6 m/s<i>. It experiences an accelerationa = -1.2m/s <i> - 1.4m/s <j>.a) In what time does the particle reach its maximum I coordinate?b) What is the speed of the particle at that moment?c) Where is the particle at that moment?

2. The velocity of a particle is given by v = {14t?î+ (4t + 3)j + 6t³k} m/s, where t is in seconds. If the particle is at the origin when t = 0, determine the magnitude of the particle's acceleration when t = 3 s. Also, what is the x, y, z coordinate position of the particle at this instant?

Can an object have a negative acceleration and be speeding up? If so, describe a possible physical situation and a corresponding coordinate system. If not, explain why not.