Calculate a) the x- and y-components of the momentum vector of a 25 kg mass traveling at 120 m/s in a direction of 120 degrees relative to the +x-axis and b) the magnitude of the momentum vector and c) the angle of the momentum vector. a mass of 40 kg travels to the right at 32 m/s. a second mass of 25 kg travels to the left at 54 m/s. calculate the total vector momentum of the system of masses. 7. a 6.5 kg rife fires a 4.5 gram bullet with muzzle velocity of 820 m/s. calculate the recoil velocity of the rifle.

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