A person has to cover a distance of 6km in 45 minutes. If he covers one-half o the distance in two thirds of the total tome; to cover the remaining distance in the remaining time, his speed (in km/hr) must be:
Correct answer: C. 12
- A. 6
- B. 8
- C. 12
- D. 15
Explanation
The person covers half the distance, which is 3 km, in two-thirds of the total time, which is 30 minutes. Now we calculate the speed needed to cover the remaining distance in the remaining time. The remaining distance is also 3 km, and the remaining time is 45mins-30mins=15mins (or 0.25 hours). So, to find out the speed needed to cover the remaining distance in the remaining time, we divide the remaining distance by the remaining time. This gives us a speed of 3km0.25hrs=12km/hr.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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