2. A car drives across a bridge supported by the ground at either end as ilustrated in
the diagram. The combined weight of the car and the bridge is 39 tons.
? tons
19 tons
39 tons
If the ground at the east end of the bridge exerts an upward force of 19 tons on the
bridge, what force is exerted by the ground on the west end of the bridge?
A. 58 tons
B. 39 tons
C. 20 tons
D. 19 tons