Question

The upper block is given a sudden velocity of 10m/s. After what time, both the block starts moving together and net work done on system up to that instantly.(the lower block is long enough ​

Answer 1

Answer:

answer is 20 s

Explanation:

a=10/t

now f=F

F=u*g=4

now F=(5+5)a; a=4/10; 10/t=4/10

t=10×10/4

t=25 s