An object having mass 1 kg is falling freely. Its velocity is `29.4 ms^(-1)` after time t= 3s, then what would be its velocity after t =4s?

Options

A. `29.4ms^(-1)`
B. `9.8ms^(-1)`
C. `39.2ms^(-1)`
D. `19.6ms^(-1)`

Answer

C

Explanation

Here, the object is performing gravitational accelerated motion. So its velocity would increase by 9.8 ms`""^(-1)` per second. Hence, after t =4s its velocity `=29.4ms^(-1)+9.8ms^(-1)=39.2ms^(-1)`