While air bags save many lives, they also have caused injuries and even death.
Research the arguments and responses of automobile makers to this statement.
Determine whether the problems involve impulse and momentum or other issues.

The density of the block of iron is lees than the density of mercury but the density of the block of iron is greater than the density of water

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)

The statement that best describes the object on the right is a bar magnet with its north pole on the left.