A body of mass 10 kg is pulled along a horizontal floor by a horizontal force of 48 N with an acceleration of 3.0 ms?. Calculate the frictional force between the body and the floor.

18 Newtons

Explanation:

The unbalance force is 10kg ×3m/s2= 30N

frictional force = 48-30= 18N

answer: a. same unit

explanation:

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