1. A human's average life span is 80.0 years. How long in earth years would the average human live if they were travelling around the universe at 0.856c? (Please show steps for both). 2. Pinoccio's nose is normally 10.0 cm long, but he stole a cookie and has been lying about it. His nose grows by 10.0 cm for each lie he makes. You are in a spaceship moving at 0.9683c relative to Pinocchio and you measure his nose to be 0.800m long. How many times has he lied?

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we need to know the time interval during which the force acts. impulse of force = momentum change

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s