Question

4. Imagine a 0.50-kg cart is launched with a velocity of 0.30 m/s. If the cart mass is tripled and its velocity is still 0.30 m/s, how is its momentum affected?

5. You attempt to tackle a football player who weighs 130 kg and is running toward you with a speed of 5.7 m/s. In another instance, when playing with your pet dog who weighs 41 kg, you try to tackle him when he is running at you with a speed of 18 m/s. Keeping significant figures in mind, which of these two tackles should be more difficult to execute?

Answer 1

4.
Momentum is given by

As velocity is kept constant

Therefore, as mass is tripled, the momentum of the system will also be tripled from its initial value.

5.
The momentum of the football player,

momentum of dog

As the momentum of the football player is higher as compared to that of the dog, it will more difficult to tackle the player as compared to the dog.