Physics

A bullet moving with a speed 150 m/s strikes a tree and penetrates 3.5 cm before stopping. Find the magnitude of its acceleration and the time taken to stop.

  1. 👍 1
  2. 👎 0
  3. 👁 397
asked by Addie
  1. Vf^2 = Vo^2 + 2ad = 0.

    (150)^2 + 2a*3.5 = 0,
    22500 + 7a = 0,
    a = -3214.3m/s^2.

    Vf = Vo + at = 0.
    Solve for t and get:
    t=(Vf-Vo)/a = (0-150) / -3214.3 = 0.0467s.

    1. 👍 0
    2. 👎 0
    posted by Henry
  2. You didn't convert cm to m

    1. 👍 0
    2. 👎 0
    posted by Trevor
  3. 32.14

    1. 👍 0
    2. 👎 0
  4. Wrong

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A rifle bullet, traveling at "v1" strikes a large tree an penetrates to a depth of "d". the mass of the bullet is "m". assume the de-acceleration is constant as it penetrates the tree. a) the time required to stop. b) the

    asked by John on September 27, 2015
  2. physics

    a 2.1 gram bullet is shot into a tree stump. Just before it hits the stump the bullet is moving at 280 m/s. The bullet penetrates into the tree and comes to a rest after having gone 5.1 cm into the tree a.What was the initial

    asked by kathy on January 10, 2010
  3. Physics

    A 7.80-g bullet moving at 590 m/s penetrates a tree trunk to a depth of 4.8 cm. Assuming the friction force is constant, determine how much time elapses between the moment the bullet enters the tree and the moment it stops moving.

    asked by Jay on March 24, 2011
  4. Physics

    A 7.80-g bullet moving at 530 m/s penetrates a tree trunk to a depth of 6.2 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming the friction force is constant,

    asked by Dani on May 3, 2011
  5. physics

    A 7.80-g bullet moving at 520 m/s penetrates a tree trunk to a depth of 4.60 cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. N (b) Assuming the frictional force is constant,

    asked by monic on October 10, 2012
  6. pme

    a bullet moving at 270 m/s penetrates 5 cm into a tree limb, beforecoming to rest assuming that the force exerted by the tree limb is uniform, find its magnitude? mass of the bullet is 10 g

    asked by babu lal on July 24, 2011
  7. Physics

    A 4.17 g bullet moving at 506.1 m/s penetrates a tree trunk to a depth of 4.64 cm. a) Use work and energy considerations to find the magnitude of the force that stops the bullet. Answer in units of N. b) Assuming that the

    asked by Madi on November 18, 2015
  8. science

    A bullet m9ving at a speed of 10m/s strikes a wooden plank . The bullet penetrates the plank 2cm deep and remains embedded in it . The acceleration of the bullet is?

    asked by samiksha on October 2, 2017
  9. Physics (High School)

    A 7.24 g bullet moving at 636 m/s penetrates a tree to a depth of 4.87 cm. Use energy considerations to find the average frictional force that stops the bullet. Answer in units of N B) Assuming that the frictional force is

    asked by Ama on December 19, 2011
  10. Physics 12

    Oh goodness, another review question. "The 2.0kg head of an axe strikes a tree horizontally at 40 m/s. The blade penetrates 0.040 m into the tree. What is the average force exerted by the blade on this tree? Is this just net

    asked by solexgirl12 on October 29, 2008

More Similar Questions