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Answers
Answer:
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Explanation:
1.When a tree is vigorously shaken, the branches of the tree come in motion but the leaves tend to continue in their state of rest due to inertia of rest. As a result of this, leaves get separated from the branches of the tree and hence fall down.
2.Given,
mass=5kg
t
1
=2s
Initial velocity u=3m/s
Final velocity v=7m/s
t
2
=5s
So,
Let the Force be F
Let the acceleration be a
So,
a=
t
(v−u)
=
2
(7−3)
=2m/s
2
So the magnitude of the applied force is 10N
And the final velocity after 5s is v
So,
v=u+at
v=3+2×5
v=13m/s
The final velocity after 5s is 13m/s
4.A horse pushes the ground in the backward direction. According to Newton's third law of motion, a reaction force is exerted by the Earth on the horse in the forward direction. As a result, the cart moves forward.
Explanation:
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