Question

Starting from a stationary position, Rahul pedals his bicycle to attain a velocity of 6 ms⁻¹ in 30 s. Then he applies brakes such that the velocity of the bicycle comes down to 4 ms⁻¹ in the next 5 s. Calculate the acceleration of the bicycle in both the cases.

Q: Answer-Starting from a stationary position, Rahul pedals his bicycle to attain a velocity of 6 ms⁻¹ in 30 s...

For the first case acceleration while speeding up o Initial velocity u 0 ms stationary o Final velocity v 6 ms o Time t 30 s o Acceleration a v - u t 6 ms - 0 ms 30 s 0.2 ms For the second case deceleration while slowing down o Initial velocity u 6 ms o Final velocity v 4 ms o Time t 5 s o Acceleration a v - u t 4 ms - 6 ms 5 s -0.4 ms negative because its deceleration