Question $1(1$ point$)$

Two carts having masses $2\mathrm{.}3$ kg and $2\mathrm{.}7$ kg are on a frictionless track. The lighter cart travelling at $5\mathrm{.}0\frac{m}{s}$ collides with the heavier stationary cart. The two carts latch together and continue rolling down the track. The velocity of the carts is now

a$)25\frac{m}{s}.$

b$)12\mathrm{.}5\frac{m}{s}.$

C$)2\mathrm{.}3\frac{m}{s}.$

d$)5\mathrm{.}0\frac{m}{s}.$

Question $2(1$ point$)$