- ce V 2 + v. 2 2(250) = ad the cargo van accelerated at 1.6mis 2 900 - 100 = a 500 Module 1: Exemplary Level (2 marks) 4) A person standing on a 50.0 m cliff throws a rock upward at 15.0 m/s. How much time will it take the rock to reach the ground? Hint: determine the final velocity first. d3 50 m 2 vs O V2 = Vi + 2 ad .06 V 1 = 15 VIFSIS/ mls V2 = 34. 7 a = 9.81 m / 2 v 2 2 = 1 15 1 2 + 2 - 9. 81) ( 50 m ) a = =4. 81 V z = 12 25) + ( 14. 62) ( 50) . hit the ta? V 2 - VI V27 = ( 2 25) + 19 81 ) a = V 2 - V , a V2 2 = 1206 m /3 2 + +20 - 15 V 2 = 7/1206 + = v 2 - vi a 4 = - 15 V2 = 31.7 += (- 34.7 ) - (15) -9: 51 - 9.81 1= 1.53 x 2 += 49.7 + = 5.065 9.81 d x 2 a