First collision

Classical Mechanics Level 2

There are two objects $A$ ( $15 \text{ m}$ above ground) and $B$ ( $10 \text{ m}$ above ground) on a straight line perpendicular to the ground. $A$ is thrown straight downward with a speed of $10 \text{ m/s}$ and, at the same time, $B$ starts to fall freely. Find the time that passes until their first collision.

0.5 seconds 0.3 seconds 2.0 seconds 1.0 seconds

2 solutions

Kartikay Shandil
Jun 9, 2014

Using the concept of relative acceleration we get acceleration of A =0, velocity of A=10. Velocity and acceleration of B=0,then the distance left to cover is 5m @10m/sec.Time taken 5/10=0.5 sec

Wow.........

ashutosh mahapatra - 6 years, 12 months ago

Manas Vema
Jun 18, 2014

USING THE CONCEPT OF TIME OF ACCENT AND DECCENT WE CAN FIND OUT. 1ST APPLYING V=U+AT(U=0) V=1.5 2ND CASE V=AT V=15/1.5 V=10 SUBTRACTING BOTH WE GET 0.5

First collision

2 solutions

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