A MAN RUNS 300M WEST IN 60SEC.THEN RUNS 100M NORTH-WEST IN 20SEC.WHAT IS IT'S AVERAGE VELOCITY IN M/S?

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Solutions for grad 11 physics all review questions

A man runs 300m west in 60 seconds. He then runs 100m northwest in 20 seconds. What is his average velocity in m/s?

To find the average velocity, we need to calculate the total displacement and divide it by the total time taken.

First, let's find the total displacement. The man runs 300m west and then 100m northwest. We can break down the northwest direction into its horizontal (west) and vertical (north) components.

The horizontal displacement is unaffected by the vertical component, so the man traveled 300m west and 100m to the west in total, which gives us a net displacement of 400m west.

Now, let's find the total time taken. The man ran for 60 seconds in the west direction and 20 seconds in the northwest direction, giving us a total time of 80 seconds.

To calculate the average velocity, we divide the total displacement by the total time:
Average Velocity = Total Displacement / Total Time

Plugging in the values:
Average Velocity = 400m west / 80 seconds

Calculating the average velocity gives us:
Average Velocity = 5 m/s west

Therefore, the man's average velocity is 5 m/s west.

Solutions

V = d/t = (300 + 100)/(60+20) = 5 m/s.