A force of 100 dynes acts on mass of 5 gm for 10 sec. The velocity produced is
2 cm/sec
200 cm/sec
2000 cm/sec
Acceleration a=Fm=1005=20cm/s2 Now v=at=20 × 10=200 cm/s
A force of 10 N acts on a mass of 5 kg for 5s. If the body is initially at rest, what is the final velocity of the body?
A body of mass 40 gm is moving with a constant velocity of 2 cm/sec on a horizontal frictionless table. The force on the table is
39200 dyne
160 dyne
80 dyne
Zero dyne
The radius of a sphere is changing at the rate of 0.1 cm/sec. The rate of change of its surface area when the radius is 200 cm, is