physics question please help .

4. A girl is swimming across a river at a velocity of 1.5m/s. The current of the river is 0.8m/s. If the river is 20 meters across, how far along the river will she end up when she reaches the other side? (3 marks) corre 1. 5+ 0.8 = 7.36/s Definite A 'talian N 29 23 = 8. 75. 5. Calculate the following (2 + 2 + 1 = 5 marks) a. What is the acceleration of a bullet reaching a velocity of 200m/s in 0.1s? 9- (200-0) a = 2090 m / 5 2 2 1.5 b. The bullet goes through a wall and exits the other side with a velocity of 80m/s. If it was inside the wall for 0.08s, what was the deceleration of the bullet? 80x0 . 08 = 6. 4 200 0- 80 a = - 1.08 6.4+80 = 86.4 h/s a = - 1500 m /s c. If the bullet has a mass of 25 grams, what was the force applied to the wall? F= 0. 025 X80 F = 0.025 X 2000 F = 2 M = SONCalculate the following (2 + 2 + 1 = 5 marks) a. What is the acceleration of a bullet reaching a velocity of 200m/s in 0.1s? 95 ( 200- 0) a = 2090 m / 5 2 1.5 b. The bullet goes through a wall and exits the other side with a velocity of 80m/s. If it was insi wall for 0.08s, what was the deceleration of the bullet? 80x0. 08 = 6. 4 a = 2000 - 80 1. 08 6.4+80 = 86.4 2/s a = - 1500 m /s c. If the bullet has a mass of 25 grams, what was the force applied to the wall? F= 0. 045 X80 F = 0. 025 X 2050 F- 2NV - SON