Question

In a class question you solved the problem of the "Ballistic Pendulum". This problem might be called a "Ballistic Spring".

A spring of equilibrium (un-stretched) length L 0 is hung vertically from one end. A mass M is attached to the other end of the spring and lowered so that the mass hangs stationary with the spring stretched a distance Δ L.

The position of the bottom end of the un-stretched spring is defined as y = 0 and shown by the (upper) blue line in the figure. The position of the end of the stretched spring is shown by the (lower) red line in the picture.

A projectile with mass m is fired vertically into the mass on the spring. The projectile has a speed v i when it hits M. The projectile becomes embedded in the larger mass so that they move upwards, compressing the spring, and reaching a maximum height y f. By measuring the maximum height of the mass (and projectile) on the end of the spring, it's possible to determine the initial speed of the projectile.

**IMPORTANT:** The maximum height, y f, is measured
from y = 0, the position of the end of the un-stretched spring. If
y f is positive, that is a position above y = 0, as usual.

In this problem, the "system" is the projectile, the mass, the spring, and the Earth.

**Part A:** Derive an equation for the spring
constant of the spring, K, using (some of) the variables defined
above. Think carefully about what you know. You shouldn't need to
write much; this should just take two or three lines.

**Part B:** Derive an equation for the speed of the
mass M and projectile m immediately after the projectile is
embedded in the mass using (some of) the variables defined above.
Again, this should just take two or three lines.

Let M=5.23 kg, m=0.12 kg, L 0=0.89 m, Δ L=0.29 m, and y f= 0.59 m.

**Part C:** Solve for the spring constant, K.

**Part D:** Write the energy conservation equation
for the total change in energy from right after the collision
(initial time) until the maximum height of the mass and projectile
(final time). This should include all energies for both the initial
and final times. Include zeros if an energy (initial or final) is
zero.

**Part E:** Solve the for the value of the initial
velocity of the projectile using the values given above. Be sure to
show your work on the pages submitted to Grade Scope. In
addition:

Answer #1

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