A rocket sled starts from rest on a straight track

PHYSICS · Single correct · CBSE · Physics · Motion in a Straight Line · Motion in a Straight Line

Problem

A rocket sled starts from rest on a straight track. Its acceleration is +6 m/s² for the first 4.0 s and then –3 m/s² for the next 3.0 s. What is the sled’s total displacement during the entire 7.0 s run? (a) 1.07×102 m1.07\times 10^{2}\,\text{m} (b) 1.20×102 m1.20\times 10^{2}\,\text{m} (c) 8.55×101 m8.55\times 10^{1}\,\text{m} (d) 1.34×102 m1.34\times 10^{2}\,\text{m}

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