Answer:
7.39 m/s is the velocity of the cue ball after impact.
Explanation:
Given that,




We know that,
If two objects collide then the “total momentum” before is equal to the “total momentum” after collision.

Substitute the given values in the formula.



The answer is D: all electromagnetic waves can travel in a vacuum
Answer:
The skidding distance would be doubled
Explanation:
When the truck applies the brakes and slows down, its motion is a uniformly accelerated motion, so its skidding distance can be found by using the suvat equation

where
v = 0 is the final velocity (zero since the truck comes to a stop)
u is the initial velocity
a is the acceleration
s is the skidding distance
The acceleration can also be written as

where F is the force applied by the brakes and m the mass of the truck. Substituting into the previous equation,

We see that the skidding distance is proportional to the mass: therefore, if the mass of the truck is doubled, the skidding distance will double as well.
He created static electricity by going down the slide, which was kept in his body and then transferred onto the conductive surface of the monkey bars