Two rail cars with masses of mA = 15 Mg and          mB = 12 Mg and velocities VA=1.5 m/s, VB=0.75 m/s are colliding head-to-head as shown. After the collision they move together.(The coupling takes place in 0.8 s.) What is the speed of the cars after the collision?

A spring with an un-stretched length of 5 in expands from a length of 2 in to a length of 4 in.  The work done on the spring is _________ in ·lb .

A rod assembly rotates around its z-axis.  The mass C is 10 kg and its initial velocity is 2 m/s.  A moment (M = 8t2 + 5 N·m ) and force (F=60 N) both act as shown.   What is the angular impulse  about z-axis due to only external force F,  after 2 seconds?

A man hits the 50-g golf ball such that it leaves the tee at an angle of 40° with the horizontal and strikes the ground at the same elevation a distance of 20 m away. Determine the impulse of the club C on the ball. Neglect the Impulse caused by the ball’s weight while the club is striking the ball.

A sports car has a mass of 2 Mg and an engine efficiency of e = 0.65.  Moving forward, the wind creates a drag resistance on the car of FD = 1.2v2 N, where v is the velocity in m/s.  The car accelerates at 5 m/s2, starting from rest. What is the magnitude of the velocity of the car when t=4 s.

Two equal-length springs having a stiffness  kA = 300 N/m and kB = 200 N/m are “nested” together in order to form a shock absorber. If a 2-kg block is dropped from an at-rest position 0.6 m above the top of the springs, determine their deformation when the block momentarily stops.

A 100 lb cabinet is placed on a smooth surface. If a force of a 100 lb is applied for 2 s, determine the impulse from the normal force for 2 s on the cabinet.(θ=20o)

BONUS (up to 3 points):  What type of anemia occurs due to an issue with the stomach?  (Identify and explain why it occurs).

What is the main ingredient of the product depicted below?

Which statement is not true about estimating basal energy requirements?