On a long horizontally moving belt (Fig. 3.26), a child runs to and fro with a speed `9 km h^-1` (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of `4 km h^-1`. For an observer on a stationary platform outside, what is the:- speed of the child running in the direction of motion of the belt ?.

On a long horizontally moving belt (Fig. 3.26), a child runs to and fro with a speed 9 km h^-1 (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of 4 km h^-1 . For an observer on a stationary platform outside, what is the:- speed of the child running opposite to the direction of motion of the belt ?

On a long horizontally moving belt (Fig. 3.26), a child runs to and fro with a speed 9 km h^-1 (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of 4 km h^-1 . For an observer on a stationary platform outside, what is the:- time taken by the child in (a) and (b) ? Which of the answers alter if motion is viewed by one of the parents ?

Fill in the blanks:- A vehicle moving with a speed of 18 km 'h^-1' covers…..m in 1 s

What is de-Broglie waveelngth of a 3 kg object moveing with a speed of 2 m s^(-1) ?

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