A body moves from rest with a constant acceleration of 5 m/s2. Its instantaneous speed (in m/s at the end of 10 sec is
Correct answer: A. 50
- A. 50
- B. 2
- C. 5
- D. 0.5
Explanation
The correct answer is 50 m/s. The formula for calculating final velocity when starting from rest and moving with constant acceleration is v = u + at, where u is the initial velocity, a is the acceleration, and t is the time. Here, u = 0 m/s, a = 5 m/s2, and t = 10 s, so substituting these values gives v = 0 + (5 × 10) = 50 m/s. Other options do not result from this calculation and therefore are incorrect.
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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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