A ball bearing is projected vertically upwards from the ground with a velocity of 15ms‾¹. Calculate the time taken by the ball to return to the ground [g = 10ms‾²]
A. 1.5s B. 3.0s C. 5.0s D. 7.5s Correct Answer: Option B B. 3.0sThe bob of a single pendulum has a mass of 0.02kg. Determine the weight of the bob [g = 10ms‾²]
A. 0.02N B. 0.20N C. 20.00N D. 200.00N Correct Answer: Option B B. 0.20N Explanation Wt = mg = 0.02 x 10 = 0.2NA force acting on a body causes a change in the momentum of the body from 12kgms-1 to 16kgms-1 in 0.2s. calculate the magnitude of the force
A. 140.0N B. 20.0N C. 4.0N D. 0.8N Correct Answer: Option B B. 20.0N Explanation F = (mv−mu)/t =(16−12)/0.2 =20NA body of mass 8kg moving with a speed of 30ms-1 is brought to rest in 2.5s by a constant retarding force. Calculate the magnitude of the force.
A. 240N B. 96N C. 20N D. 9N Correct Answer: Option B B. 96N Explanation F = ma = mv/t=(8×30)/2.5 =96Products
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