Dave and Alex push on opposite ends of a car that has a mass of 875 kg. Dave pushes the car to the right with a force of 250 N,
1 answer:
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Answer:
The resulting velocity for him will be 0.187 m/s in reverse direction.
Explanation:
Given:
The mass of the man is,
The mass of the ball is,
The initial velocity of the man is,
The initial velocity of the ball is,
The final velocity of the ball is,
The final velocity of the man is,
To determine this scenario, we employ the principle of momentum conservation.
This principle states that the total initial momentum equals the total final momentum.Momentum is calculated by multiplying mass by velocity.
Initial momentum = Initial momentum of the man and the ballInitial momentum =
Final momentum = Final momentum of the man and the ball
Final momentum =
Hence, the total initial momentum equals the total final momentum
The negative sign indicates that the man moves backward.
Thus, his final velocity ends up being 0.187 m/s backward.
Answer:
2.57 hours
Explanation:
Let t (in hours) represent the time it takes for Elsie to walk until they are separated by 25 miles. Since Steve starts 2 hours earlier, his time will be t + 2.
The distance covered by Steve heading north is
The distance Elsie travels heading west is
The separation between Steve and Elsie is
We can solve for t by squaring both sides.
Therefore, t = 2.57 or t = -4.13.
Since t cannot be negative, we select t = 2.57 hours.