During a football workout, two linemen are pushing the coach on the sled. The combined mass of the sled and the coach is 349.0 kg. The coefficient of friction between the sled and the grass is 0.860. The sled accelerates at a rate of 0.670 m/s/s. Determine the force applied to the sled by the linemen in newtons. Round to a whole number. (Use g=9.81 m/s2.

Sorry i don’t know what to do

Answervery cold;

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)