KVPY 2020-21 SA Exam Previous Papers

Question : 16 of 80

Marks: +1, -0

PART-I : PHYSICS

A mouse jumps off from the 15

^{\th }

floor of a high-rise building and lands 12 m from the building. Assume that each floor is of 3 m height. The horizontal speed with which the mouse jumps is closest to:

0
5 kmph
10 kmph
15 kmph

Validate

Solution:

Total height of

15^{\text "th "}

floor

h=15 \×3=45 {m}

Time taken to reach bottom

t=\√{{2 h}/{g}}=\√{{2 \× 45}/{10}}=3 {sec}

Let horizontal speed of mouse is

v

\∴12=v \×t

\⇒v={12}/{3}=4 {m} \/ {s}

⇒ v = 14.4 km/h
Which is closest to 15 kmph.

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