2) An archer shoots an arrow horizontally. After 4 seconds it lands on the ground 520m away from the archer.
a) What is the horizontal velocity of the arrow when it is released?

Can someone please answer this right.
b) What is the actual velocity of the arrow when it hits the ground?

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.

The radius of an atom is closest in size to a

Select all the correct answers. which three statements about electromagnetic radiation are true?