A block of mass 0.5kg is pulled to the right with an applied force 3N at an angle 30 degrees above horizontal as shown. Ignoring friction, the acceleration of the block is... A. 1.8
B. 3
C. 5.2
D. 6

The answer is C, 5.2

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

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