Q. A moving car possesses average velocities of 5ms-1, 10ms-1 and 15 ms-1 in the first, second, and third seconds respectively. What is the total distance covered by the car in these 3s ?
(a) 15m
(b) 30m
(c) 55m
(d) 45m
Ans: (b)
Sol:
$ \displaystyle S = v_1 t_1 + v_2 t_2 + v_3 t_3 $
$ \displaystyle = 5\times 1 + 10 \times 1 + 15 \times 1 $
= 30 m