An object that has momentum must have
1 answer:
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Answer:
Speed of lighter ball is 4 m/s.
Explanation:
Applying the principle of conservation of linear momentum,
momentum before collision = momentum after collision.
+
=
-
= 3 kg,
= 8 m/s,
= 2 kg,
= 0 m/s ( since it is at rest),
= 2 m/s,
= ?
(3 x 8) + (2 x 0) = (8 x 2) - (2 x )
24 + 0 = 16 - 2
2 = 16 - 24
2 = -8
=
= -4 m/s
This implies that the light ball moves at the speed of 4 m/s in the opposite direction of the heavier ball after collision.
Answer:
the speed at which Noelle walks from point B to A, v=7.5 kilometers per hour
Explanation:
In this question we have given
average speed for the entire trip,S = 6 kilometers per hour
Speed of Noelle while walks from point A to B= 5 kilometers per hour
Therefore, time taken by Noelle to walks from point A to B,
Let us consider distance between A and B is d.
Therefore total distance covered in moving from point A to B and then moving back from point B to A, =
Let v be the speed at which Noelle walks from point B to A
Therefore time taken by Noelle to walks from point B to A,
we know that average speed S is given as
................(1)
here, x (=2d) is total distance
and t (= ) is total time
put values of S, x and t in equation 1
on solving we get,
v = 7.5 kilometers per hour
Therefore, the speed at which Noelle walks from point B to A, v=7.5 kilometers per hour