Question

A particle falling under gravity describes soft in a certain sec. How long does it take to describe next 112ft?[g=32fts*2}

Answer 1

Answer:

1s

Explanation:

Let us consider the velocity of particle when it completes 80 ft is V and this velocity will be initial velocity for 112 ft height. Let us consider it takes t time.

g=32ft/s

2

V

2

=u

2

+2gh

V

2

=O

2

+2×32×80

V=

64×80

V=8×4

5

V=71.55 ft/s

now, h=vt+0.5×g×t

2

112=71.55t+0.5×32×t

2

On solving,

t=−h±

h

2

−4ac

/2α

t=1 seconds

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