The equation of acceleration in downwards motion of the block is written as, a=g‌sin‌θ−µg‌cos‌θ Substitute the given values as a‌‌=g(sin‌45∘−0.3‌cos‌45∘) ‌‌=‌
10
√2
(1−0.3) ‌‌=‌
10×0.7
√2
m
s2
The displacement of the block is calculated from the second equation of motion as, s‌‌=ut+‌