14. jamal, a professional bicycle racer, is explaining to a group of students how technology has made it easier to
cycle faster. he states that bicycles can be made of much lighter materials now, so they need (sps8l2]
a. more force to push them forward.
c. more friction to keep them from rolling.
b. less force to push them forward. d. more gravity to increase their speed

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

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.