Problem-solving strategies for analyzing dynamics problems Whiplash e...

Problem-solving strategies for analyzing dynamics problems

Whiplash experience A car sitting at rest is hit from the rear by a semi-trailer truck moving at 13 m/s. The car lurches forward with an acceleration of about 300 m/s². Figure P3.25 shows an arrow that represents the force that the neck muscle exerts on the head so that it accelerates forward with the body instead of flipping backward. If the head has a mass of 4.5 kg, what is the horizontal component of the force Fu required to cause this head acceleration? If Fu is directed 37^o below the horizontal, what is the magnitude of Fu?