For finding the normal reaction, R - (0.5g cos α) - (P sin α) = 05 * 0 (zero because, no acc. upwards)
Now equation for the motion of direction (P cos α) - (0.5g sin α) - (0.5* Value of R) = 0.5 * 0 (zero because, speed is 'constant')
So, am i going right? The magnitude of R which i m...