The system shown in the figure consists of a block of 4.00 mass, which can move on a horizontal surface with a kinetic friction coefficient of 0.30, and which is attached to a spring with a force constate of 200 / by means of an ideal rope, passing through an ideal pulley. The system is initially at rest, with the spring relaxed until suddenly the block is struck to the right, such that instantaneously its speed becomes 178 /. Determine:
The initial mechanical energy of the system.
The velocity of the block when the spring momentarily returns to its relaxed state, after having reached its maximum elongation.

A2 kg ball travellng to the right with a speed of 4 m/s collidees with a 5 kg ball traveling to the left with a speed of 3 m/s. take right to be the positive direction. what is the total momentum of the two balls before they collide? what is the total momentum of the two balls after they collide?

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Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience.b. report the adverse drug experience to the irb only if there are several other occurrences.c. report the adverse drug experience as part of the continuing review report.d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.