Mechanics — Question 83
Original QCE Vault practice · 1 mark
Q83 · Practice questionSimple familiar1 mark
QUESTION 83
A 5 kg block is on a smooth plane inclined at 20∘. A 30 N force acts up the plane. Taking g=9.8 ms−2, the acceleration up the plane is approximately (A)1.35 ms−2 (B)2.65 ms−2 (C)3.42 ms−2 (D)5.88 ms−2 WORKED SOLUTION
Answer B
1 markWorked solution
Newton’s second law along the plane gives 5a=30−5(9.8)sin20∘. Therefore a=6−9.8sin20∘≈2.65 ms−2. Selects the correct option.
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