Question

solve the problem....................

Answer 1

$a = \frac{v - u}{t} \\ = \frac{20 - 10}{ 4} \\ = \frac{10}{4} \\ = 2.5m {s}^{ - 2}$

Answer 2

(20-10)/4
(V-U)/T = Acceleration
10/4 = a
2.5m/s² = a
And the ques. has a misprint of scooter and train.