If, in the previous question, there is a 15 N kinetic frictional force opposing the motion,
how much work is
done by the force of friction? Does friction do
positive work or negative work on the block?

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane