Question

3. A car is traveling at 55 MPH? a) What does it mean to say that this car is traveling at 55 MPH? b) How many miles the car will cover in 120 minutes? 4. You are driving at 18 m/s, and a cat runs out in front of your car. You stop rani which takes 3 seconds, and miss the cat. What is your deceleration? 5. A car traveling in a straight line with an initial velocity of 10 m/s accelerates at a rate of 4 m/s to a velocity of 30 m/s. a) How much time does it take for the car to reach the velocity of 30 m/s? b) What is the distance covered by the car in this process?

Answer 1

5 O 3. A caso is traveling at 55 MPH. a) It means that the velocity of the car is 55 MPH. The car travels 55 mile in One hour. b) In 60 minutes the caso cover=55 mile Hense in 120 minutes the canwill covers = 55 x 120 = 110 mile

© Initial velocity (vi) = 18 m/s Final velocity (Vf) = 0 time (t) = 35 Deceleration - Vf - Vi ☺ 1t -(0-18) m/s 3 = - 6 m/s A car traveling in a straight Initial velocity (u) = 10 m/s Final relocity (v) = 30 m/s Acceleration (a) = 4 m/s2 line.

a) We use the formula V= ut at t = v-u a - (30 - 10) m/s - 4 m/s2 = 45 Hense It take us for the car. to reach the velocity of 30 m/s. 6 The distance covered by the car in this process, = ut t I at² = (1084) + 4X (4) ² = 40 + 32= 72 m

9. A=3i-4; B=5it67 c=-21 - 2)

C1 a) 2(A-c)+ 3B = 2 (3. – 41) – (-2;-2;)]+ 3 (si +63) = 23 - 41 +21+ 2] + 15 +18j = 2 [5i - 2;] + 15i + is j = 10i - 45 + 15i + 183 = 251 +14 U

3B –ус + А = 3 Si +6) --21-25) + (зі — 45) E 1Si +18ј +81 +8ј+37 — 9Ј - 26i + 22 ј