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A dolphin is swimming under water at a constant speed of 4.50ms-1.
(a) The dolphin strikes the bottom of a floating ball so that the ball rises vertically upwards from
the surface of the water, as illustrated in Fig. 2.1.
h
path of
ball
height of
ball above
surface
ball
surface of water
speed 5.6 ms-11
Fig. 2.1
The ball leaves the water surface with speed 5.6 ms 1.
Assume that air resistance is negligible.
(0)
Calculate the maximum height reached by the ball above the surface of the water.

Ibelieve the answer is either b or c, but i'm leaning more towards c.hope my answer has you : )

When seismic waves hit a fault, the waves are reflected off the fault. seismograph can detect these reflected seismic waves. geologists then use these data to map the fault's length and depth

The answer is d, you can easily test a theory! hope i you : )

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)