Question

A driver is $20$ m below sea level. If he goes further down by $10$m, then find his new position.

• A. $10$m
• B. $-10$m
• C. $30$m
• D. $-30$m

Answer 1

The correct option is D $-30$m

Let the ground level indicated by the brown line be 0. Then all distances travelled in the upward direction will be +ve and all the distances travelled in the downward direction will be _ve.

From the figure, it is clear that the new position of the driver is $(-20)-10=-30⟹$ $30m$ below sea level.