An object has a initial velocity of 15 m/s. How long must it accelerate at a constant rate of 3m/s2 before its final velocity is equal to twice its initial velocity?

tortoise crawls the entire 1000.0 meters at a speed of 0.20 m/s. The rabbit runs the first 200.0 meters at 2.0 m/s, stops to take a nap for 1.3 hours, and awakens to finish the last 800.0 meters with an average speed of 3.0 m/s. Who wins the race and by how much time? Get to destination at the same time. Rabbit wins by 47 s Tortoise wing by 47 s O rabbit wins by 2.02 hrs Tortoise wins by2.02 hours

A rocket is fired straight up from rest with a net upward acceleration of 12 m/s2. After 10.0 s, the engine shuts off, but the rocket continues to coast upward with insignificant air resistance. What is the maximum the rocket reach from the ground?

A cart is given an initial velocity of 13.5 m/s and experiences a constant acceleration of 2.5 m/s2. What is the magnitude of the cart's displacement during the first 11 s of its motion?

A rock is dropped off of a cliff. It takes 2.8s for the rock to reach the bottom. The acceleration due to gravity is 9.81 m/s2. How tall is the cliff?

Traumatic brain injury such as concussion results when the head undergoes a very large acceleration. Generally, an acceleration less than 800 m/s2 lasting for any length of time will not cause injury, whereas an acceleration greater than 1000 m/s2 lasting for at least 1 ms will cause injury. Suppose a small child rolls off a bed that is 0.36 m above the floor. If the floor is hardwood, the child's head is brought to rest in approximately 2.2 mm. If the floor is carpeted, this stopping distance is increased to about 1.2 cm. Calculate the magnitude and duration of the deceleration in both cases, to determine the risk of injury. Assume that the child remains horizontal during the fall to the floor. Note that a more complicated fall could result in a head velocity greater or less than the speed you calculate. Hardwood floor magnitude  m/s2 duration  ms Carpeted floor magnitude  m/s2 duration  ms

An object has an initial velocity of 15 m/s.  How long must it accelerate at a constant rate of 3 m/s2 before its final velocity is equal to twice its initial velocity?

A particle is initially traveling east at 5 m/s , then it begins to have an acceleration of 10 m/s2 in the north direction. What can you say about its velocity after a long period of time.

A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground? 1.0 s 3.5 s 6.1 s 1.6 s 2.0 s

Your motion begins at rest and consists of acceleration at 2.0 m/s^2 for 10 seconds, then a period of7.5 seconds with no acceleration, then deceleration at -1.0 m/s^2 for 20 seconds, resulting in a finalspeed of zero. The total distance traveled is 450 m. What is your average speed during this motion? Group of answer choices 10 m/s 42 m/s 12 m/s 16 m/s zero