Answer:
1.3889 x 10¹¹ miles.
Explanation:
2 Years = 2 x 365 days = 730 days
2 years and 9 days = 739 days .
739 days = 739 x 24 = 17736 hours
2 years 9 days and 4.5 hours = 17736 + 4.5 = 17740.5 hours
17740.5 hours = 17740.5 x 60 x 60 = 63.865 x 10⁶ s
Distance travelled = velocity x time
2174.799173 x 63.865 x 10⁶ = 1.3889 x 10¹¹ miles.
Initial speed(u)=0m/s
Final speed(v)= 27m/s
Time(t)=7.6s
Use the equation of motion: v = u + at
27 = 0 + a(7.6)
27/7.6 = a
a = 3.55 m/s^2 (3 s.f)
Answer: 1687.5 N
Explanation:
From the second law of motion given by Newton, Force is the rate change of momentum.
Mass of the baseball, m = 0.15 kg
Initial velocity, 
(negative because direction of initial velocity is opposite to the final velocity)
Final velocity, 
The duration of collision, 
Force, 
Hence, the value of force is 1687.5 N.
<u>Harmful</u><u />
-causes heat; if it's not used correctly, it can cause injury
-when falling, the friction between your knee/leg and the ground can cause scrapes
<u>
</u><u>Helpful</u><u />
-helps stop the bike, the brakes rub against the tire which slows it down to a stop
-it can also help move the bike; the chains rub against tires which accelerate the bike
