69) A mild steel rod of 25 mm diameter is subjected to tensile load of 1000 kg. Calculate the stress

70) A car moving at a speed of 25 km/hour is brought to rest in 20 seconds. Find out the distance travelled by the car before coming to halt.

71) One train 60 meters long is running with a speed of 20 km per hour. It passes from a bridge of 90 meters long. What time will be taken by the train to pass from bridge?

72) In the metal conduit system of wiring where there is a zigzag wall protection, the cables can be run by using

73) ON plotting the graph A(1,0), B(3,0), C(4,4), D(1,4) and joining AB, BC, CD and DA, which of the following figures is obtained?