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Answers
Explanation:
Problem 1: A toy car accelerates from 3 m/s to 5 m/s in 5 s. What is its acceleration?
Answer:
Given: Initial Velocity u = 3 m/s,
Final Velocity v = 5m/s,
Time taken t = 5s.
Acceleration formula 5
acceleration formula 6
acceleration formula 7
acceleration formula 8
Problem 2: A stone is released into the river from a bridge. It takes 4s for the stone to touch the river’s water surface. Compute the height of the bridge from the water level.
Answer:
(Initial Velocity) u = 0 (because the stone was at rest),
t = 4s (t is Time taken)
a = g = 9.8 m/s2, (a is Acceleration due to gravity)
distance traveled by stone = Height of bridge = s
The distance covered is articulated by
Acceleration formula 9
s = 0 + 1/2 × 9.8 × 4 = 19.6 m/s2
Therefore, s = 19.6 m/s2