2.2. 1 Driving at 36 m. s? (130 km. h ?) along a straight horizontal road (in a 90 km. h?i. e. 25 m. s zone), the driver sees a speed trap 69 m ahead. The driver's reaction time is one second i. e. it takes one second before the brakes are applied. The car then decelerates at 6 m. s2. Calculate the distance covered during the reaction time. ​

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.