A particle has initial velocity $$\left( {2\overrightarrow i + 3\overrightarrow j } \right)$$ and acceleration $$\left( {0.3\overrightarrow i + 0.2\overrightarrow j } \right)$$. The magnitude of velocity after 10 seconds will be

The horizontal range and the maximum height of a projectile are equal. The angle of projection of the projectile is

A projectile is fired at an angle of 45^o with the horizontal. Elevation angle of the projectile at its highest point as seen from the point of projection, is

A body is moving with velocity 30 m/s towards east . After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is