An object has a mass of 100 lb is projected from the ground level in the air at an angle of 60 degrees with the horizontal direction with a velocity of 72 km/hr. What is the projection velocity in m/s ?

72 km/hr = 72000/3600 = 20 m/s

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To find the projection velocity in m/s, we need to convert the given velocity from km/hr to m/s.

The conversion factor to convert km/hr to m/s is 1 km/hr = 0.2778 m/s.

Given that the velocity is 72 km/hr, we can calculate the projection velocity in m/s as follows:

Projection velocity (m/s) = Velocity (km/hr) * Conversion Factor (m/s)
= 72 km/hr * 0.2778 m/s
≈ 19.44 m/s

Therefore, the projection velocity is approximately 19.44 m/s.