Using the equation of motion: $$v = u + at$$, where $v$ is the final velocity, $u$ is the initial velocity, $a$ is the acceleration, and $t$ is the time.
$$10 = \mu \times 5 \times 9.8$$
Given: $v = 20$ m/s, $u = 0$ m/s, $t = 5$ s m karim physics numerical book solution class 11
$$f = 20 - 10 = 10$$ N
Using the equation of motion: $$v = u + at$$, where $v$ is the final velocity, $u$ is the initial velocity, $a$ is the acceleration, and $t$ is the time.
$$10 = \mu \times 5 \times 9.8$$
Given: $v = 20$ m/s, $u = 0$ m/s, $t = 5$ s
$$f = 20 - 10 = 10$$ N