Question

The velocity-time graph for the vertical component of the velocity of a body thrown upwards from the ground and landing on the roof of a building is given in the figure. The height of the building is

• A. 50 m
• B. 40 m
• C. 20 m
• D. 30 m
• E. 10 m

Answer 1

Answer: (B)

We know that,
Height = area under v -t graph
So, weight $=\frac{1}{2} \times 30 \times 3-\frac{1}{2} \times 10 \times 1 $
$=\frac{1}{2} \times 90-\frac{1}{2} \times 10 $
$=45-5=40\, m$