Question

7 if a rocket travels 1000 km west for 1 hour, what is its velocity? e yellow 1000km/hr w blue 500 km/hr w orange 250 km/hr w 8 a swimmer swims for 2 kilometers north in a time period of 1 hour. what is the velocity? orange 2 km/hr n blue 2 km/hr w green 2 km/hr s purple 9 what is the acceleration of a car that accelerates from 0 to 60m/s in 10 seconds? green 4 m/s² purple 5 m/s² red 6 m/s² 10 a race car accelerates from 0m/s to 18m/s in 2 seconds. what is its acceleration? pink 5 m/s² blue 9 m/s² brown 7 m/s² 11 a roller coaster car slows down as it approaches the end of the ride. as it enters the final stretch, its speed is 24 m/s. but 4 seconds later, at the end of the ride, its speed is 8 m/s. what is its average acceleration? blue 4 m/s² yellow -6 m/s² orange -4 m/s² 12 in a storm, the wind is blowing with a velocity of 12 m/s. in 4 seconds, the wind’s velocity becomes 6 m/s. what is the wind’s acceleration? 5 m/s² blue -1.5 m/s² yellow 3 m/s² pink (left side handwritten notes: v = v_i + at; a = v_f - v_i / t; v_f = v_i + at; s = vt; s = (v_i + v_f)/2 * t; given, equation, plug in #s, answer with units; t = 20s, d = 800m, s = d/t = 800m/20s = 40m/s; s = 40m/s)

Explanation:

Step1: Identify the problem (Problem 7)

We need to find the velocity of a rocket that travels 1000 km West in 1 hour. Velocity is a vector quantity, so we need to include direction.

Step2: Recall the formula for velocity

Velocity \( v = \frac{\text{displacement}}{\text{time}} \). Displacement here is 1000 km West, time is 1 hour.

Step3: Calculate the magnitude of velocity

Magnitude: \( v = \frac{1000 \, \text{km}}{1 \, \text{hour}} = 1000 \, \text{km/h} \). Direction is West.

Step4: Match with the options

Looking at the options for problem 7, the first option (Yellow) has 1000 km/hr W, which matches our calculation.

Answer:

Yellow. 1000 km/hr W