10th
10. A motorist is travelling at 54 km/hr when he observes a traffic signal at a distance of 280 m ahead turning red at time t = 0. If he decides to decelerate & then accelerate by the same magnitude, so as to pass the signal at 54 km/he at t = 28 seconds, when the signal turns green, then
(A) Magnitude of deceleration is m/s2 (B) Magnitude of deceleration is 1 m/s2
(C) Minimum speed reached is 5 m/s (D) Minimum speed reached is 10 m/s