Suppose the block of the previous problem is pushed down the incline with a force of 4 N. How far will the block move in the first two seconds after starting from rest? The mass of the block is 4 kg.
Mass of the block m= 4kg
When no external force was applied, net force was given as
= mgsin30°-f
Here, external force F= 0.9m
Total net force along the inclination= mgsin30°-f+4 N
4× 9.8 × – (0.9 × 4)+ 4 N
= 20 N
Hence, the acceleration of the body a= ==5 m/s2
The distance travelled in time 2 secs after starting from rest is given by
s= ut + at2
= 10m