What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits? What prin
1 answer:
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Answer:
14.8 m
Explanation:
S= ut + a
where u = initial velocity
S= (0 )(2
) +
(7.4
)(2
)
S= (7.4
)(2
)
S=14.8 m
<h2>Thus the force of friction is 235 N</h2>
Explanation:
When the bear was at the height of 14 m . Its potential energy = m g h
here m is the mass of bear , g is acceleration due to gravity and h is the height .
Thus P.E = 27 x 10 x 14 = 3780 J
The K.E of the bear just before hitting = m v²
= x 27 x ( 6.1 )² = 490 J
The force of friction f = P.E - K.E = 3290 J
Because the work done = Force x Distance
Thus frictional force = = 235 N