Asound wave is used to mesure the distance from the ship to the sea bed. an electronic device
placed in the ship traces a pulse sent from the ship and reflected pulse that returns. the
time-base setting for the x-axis is 60 ms per division.
the speed of sound wave in water is 1500 m/s. find
the distance from the ship to the sea bed.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.