# 400 - Physics Questions Answers

Three identical metal spheres each of radius r are fixed at the vertices of an isosceles right angled triangle , assume r<

**Asked By: AYAN KAR**

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Two boys enter a running escalator at the ground floor of a shopping mall . The first boy repeatedly follows a cycle of p1=1 step up and then q1=2 steps down whereas the second boy repeatedly follows a cycle of p2=2 steps up and then q2=1 step down. Both of them move relative to escalator with a speed v=50cm/s . If the boys take t1=250s and t2=50s respectively to reach the first floor in complete number of cycles, how fast is the escalator running ?

**Asked By: JATIN KUMAR**

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A particle projected from the ground passes two points , which are at height 12m and 18m above the ground and a distance d=10m apart . What could be the minimum speed of projection. Acceleration due to gravity is g=10m/s^2 .

**Asked By: JATIN KUMAR**

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