A glider moves rightward at on a frictionless track

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A 1.5 kg1.5\,\text{kg} glider moves rightward at 0.40 m s−10.40\,\text{m\,s}^{-1} on a frictionless track. During the next 0.20 s0.20\,\text s, it is subjected to the following time-dependent horizontal forces (positive is rightward): • 5 N5\,\text N from t=0t=0 to 0.05 s0.05\,\text s • 8 N8\,\text N from t=0.05t=0.05 to 0.10 s0.10\,\text s • 4 N4\,\text N from t=0.10t=0.10 to 0.15 s0.15\,\text s • −2 N-2\,\text N from t=0.15t=0.15 to 0.20 s0.20\,\text s Calculate the glider’s velocity at t=0.20 st=0.20\,\text s, including direction.

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