Answer:
8.9m/s
Explanation:
Final velocity = initial velocity + acceleration *time
Vf=vi+at
Vf=1.4 m/s
Vi=?
A=-2.5m/s^2
T=3
1.4m/s=vi+(-2.5m/s^2)(3s)
Vi=8.9m/s
Answer:
a).
The magnitude force impulse is
the average force is
Explanation:
Using the conservation energy the potential energy in the high is equal to the kinetic energy just before the collision so:
Notice the mass can be cancel as a factor so:
Now the impulse is determinate by:
The average force is also
20km/s2
Explanation:
a=(final velocity-initial velocity)/time
final velocity=a * time + initial velocity = 2km/s2 * 4s + 12km/s = 20km/s2