A boy is playing with a tire of radius 0.5m. He accelerates it from 5rpm to 25 rpm in 15 seconds. The linear acceleration of tire is
10 m/s2
7 m/s2
0.07 m/s2
70 m/s2
For a particle moving in a circle of radius 1 m, speed increases uniformly from 5 m/s to 10 m/s in 10 seconds. The value of angular acceleration of the particle is
A car decreases its velocity from 80 kmhr−1 to 60 kmhr−1 in 5 seconds. The acceleration of the car is