Question

PLEASE HELP!!!! An 85 kg snowboarder accidentally goes off trail and ends up in the middle of a frozen lake and comes to a stop. He remembers taking physics and learning about conservation of momentum in high school and decides to take off his 10 kg backpack

and throw it as hard as he can since he won't need it from being so smart for passing physics) at a speed of 6 m/s East. At what speed and direction will the snowboarder move after throwing the bag?

Answer 1

Step-by-step explanation:

• Okay, so the snowboarder weighs 85 kg and his backpack weighs 10 kg. He throws the backpack with a speed of 6 m/s to the East.

• According to the law of conservation of momentum, the total momentum before he throws the backpack is 85 kg * 0 m/s (since he's at rest) and the total momentum after he throws the backpack is 85 kg * x m/s + 10 kg * 6 m/s (since the backpack is moving East with a speed of 6 m/s).

• To find the snowboarder's new speed and direction, we have to set the total momentum before and after equal to each other and solve for x. So,
• 85 kg * 0 m/s = 85 kg * x m/s + 10 kg * 6 m/s

• We can solve for x by subtracting 10 kg * 6 m/s from both sides and dividing by 85 kg.
• x = -0.7143 m/s

• So the snowboarder will move with a speed of -0.7143 m/s (which means he will move in the opposite direction of the backpack) and he will move west.