On a snowy day, max (mass = 15 kg) pulls his little sister maya in a sled (combined mass = 20 kg) through the slippery snow. max pulls on the sled with 12 n of force, directed at an angle of 15° above the ground.
when he comes to a recently plowed section of road, he continues to pull the sled with the same force across the road while the road exerts a frictional force of 4 n on sled.

if the sled's speed is 1.5 m/s as max pulls it onto the road, what is the sled's speed after max pulls it 5 m across the road? a)2.0 m/s
b)2.8 m/s
c)2.5 m/s
d)3.2 m/s
e)6.0 m/s

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.