A ball of mass 0.2 kg is thrown with a velocity of 50 m/s at an angle of 30° from the horizontal. Using the concept of impulse, find the change in velocity in 3 s.
#impulse #momentum #collision
#impulse #momentum #collision
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00:00Hi friends, learning is the key to unlocking the door to success.
00:06Make every lesson an opportunity to grow and develop.
00:12One method of learning is to find the answer to a question.
00:17In this series, we will calculate the change in velocity using the concept of impulse.
00:25Let's discuss.
00:28A ball is thrown from the ground at an angle of 30 degrees.
00:33Of course the ball will go through a parabolic path.
00:39Why is that?
00:40Apparently the mass is attracted to the center of the earth by the force of gravity.
00:47Along the path, the ball gets a vertical gravitational force downward.
00:52In fact, the force causes acceleration.
00:56With another time, the ball moves accelerated downward.
01:00Meanwhile, in the horizontal direction, there is no force at all.
01:05The speed in the horizontal direction will not change.
01:09Indirectly, this question asks us to calculate the change in velocity in the vertical direction.
01:18We know that impulse is related to average force.
01:22J is the same as F t.
01:26On the other hand, impulse is also a change in momentum.
01:30J is the same as m delta V y.
01:35In V there is a subscript y as a marker for the direction of velocity.
01:42Compare the two equations.
01:46The force of gravity is the multiplication of mass and the acceleration due to gravity.
01:54It seems we can cross out the value of m.
02:00Delta V y is equal to g t.
02:03We can see the value from the problem sheet.
02:09The result is 30 meters per second.
02:12The direction of the impulse is in the same direction as the force.
02:19Since the direction of gravity is downward, we can give a minus sign to indicate that
02:24the impulse is also downward.
02:32Happy learning everyone!