A motorcycle rider travelling at 30m/s sees a child run into the streets 190m ahead. If the rider takes 1 second to react before
1 answer:
Answer:
The distance by which the child is safe is
Explanation:
From the question we are told that
The speed of the motorcycle is
The distance of the child from the motorcycle is L = 190 m
The reaction time is
deceleration is
Generally the distance covered during the reaction time is
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=>
Generally the distance covered during the deceleration
Here v is the final velocity which is zero
So
=>
So the total distance the motorcycle rider will cover before coming to rest is
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=>
Therefore the amount of distance by which the child id safe is
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Answer:
Therefore, both balls will hit the ground at the same distance from their respective starting points and at the same time.
Explanation:
Both balls will hit the ground at the same distance and at the same time assuming they both start at the same initial elevation from the ground.
We know that range in the projectile motion given as
sin 60° = sin 120° =0.866
Therefore, the maximum range will be identical assuming both golfers hit the ball at the same elevation from the ground.
As for the time...
Where v is 0 m/s (final velocity at highest point), v0 is the initial velocity (for both golfers) and is the acceleration due to gravity (-9.8 m/s^²). As you can see, the time it takes to get to the highest point is independent of the angle; it is only dependent on the initial velocity. Since both golfers hit the ball with the same speed, the time for the ball to reach the highest point will be the same. Also, since it's a parabola, you can multiply the time by 2 for each golfer to get the time it takes to hit the ground.
Therefore, both balls will hit the ground at the same distance from their respective starting points and at the same time.